njdep - njgs - geologic map series gms 06-4, bedrock ......47 kwb 78 kmv 30-9721 46 kwb 72 kmv...

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B' Kp3 Kmg Kmg Kmv Kmv Kp3 Kmg Kmv Kwb Kwb Kwb Kmv Kmg Kmv Ket Ket Kmt Kmt Kw Kw Kmt Kw Kml Kml Kmt Ket Ket Kwb Kmv Kmg Kwb Kmv Kp3 Kmg Kp3 Kmg Kmg Kmv Kmv Kwb Ket Kmt Kw Kmt Ket Kw Kml Kml Tkw Tvt Tht Tvt Tht Kns Tht Kns Tht Tvt Kns Kns Tvt Tht Tht Tvt Tkw Tkw Kns Kns Tkw Tvt Kml Kml Kw Kmt Kw Kmt Ket Ket Kmv Kwb Kwb Kmv Kmg C' A' C D' B D A 30-7693 Kp3 30-8433 Kp3 PG-13 Kp3 30-10134 Kp3 30-963 Kp3 PG-12 Kmg Penns Grove well 2 30-467 Kp3 30-8119 Kp3 30-3381 Kp3 30-6723 Kp3 30-10762 Kmg 30-9600 Kmg 30-5768 Kmg 30-1772 Kmg 30-8393 Kmg 30-5842 Kmg 30-9483 Kmg 30-7118 Kmg 30-4708 Kmg 30-8177 Kmv 30-9028 Kwb 30-9449 Kmg 30-4403 Kmg 30-4308 Kwb 30-6602 Kwb 30-2656 Kwb PG-15 Kwb-Ket 30-5726 Kmt 30-8604 53 Kwb 72 Kmv 30-5189 Kwb 30-8260 45 Kwb 75 Kmv 30-5063 Kwb 30-9881 Kwb PG-7 Kwb 30-3454 15 Ket 65 Kwb 100 Kmv 30-9378 Ket 30-4634 85 Ket-Kwb 103 Kmv 30-1842 Ket 30-9041 Kwb 30-7813 23 Kwb 52 Kmv 30-9374 Kmg 30-4771 Kmg 30-6522 Kmg 30-4661 Kmg 30-10374 Kp3 30-8768 Kmg 30-6729 Kmg 30-244 Kmg PG-6 Kmg 30-8530 Kmg 30-8017 Kp3 30-8261 Kp3 30-9872 Kmg 30-10635 Kmg 30-527 Kp3 30-529 Kp3 30-563 Kp3 30-3535 Kp3 30-5310 Kp3 30-526 Kp3 30-8511 Kp3 30-5441 Kmg 30-266 Kmg 30-8149 Kp3 30-1143 Kp3 33-343 30-8061 Kp3 30-620 Kp3 30-5287 Kp3 30-618 Kp3 30-5204 Kp3 33-328 30-9191 Kp3 30-9727 Kp3 30-9595 Kp3 30-8835 Kp3 30-8190 Kp3 30-7608 Kmg 30-5339 Kmg 30-9165 Kmg 33-332 Kmg 30-1815 Kmg 30-1113 Kmg 30-7104 Kmg 30-10642 50 Kwb 69 Kmv 30-6184 47 Kwb 78 Kmv 30-9721 46 Kwb 72 Kmv 30-7532 Kwb 30-2177 Kwb 30-8564 Kwb 30-7543 87 Kwb 96 Kmv 30-8946 70 Kwb 115 Kmv 30-5228 70 Ket-Kwb 105 Kmv 30-2747 Ket 30-3918 50Ket 95 Kwb 129 Kmv 30-76 Kwb 30-9169 61 Kwb 70 Kmv 30-8995 95 Kwb 108 Kmv 30-9170 64 Kwb 100 Kmv 30-3858 Ket-Kwb PG-8 Kmt 30-8529 55 Kmt-Ket 121 Kwb 146 Kmv 30-7065 Ket 30-6604 110 Kmt-Ket-Kwb 145 Kmv 30-5924 Kmt-Ket 30-10179 67 Ket-kwb 105 Kmv 30-7591 97 Ket-Kwb 106 Kmv 30-4532 70 Ket-Kwb 111 Kmv 30-196 110 Kmt-Ket-Kwb 140 Kmv 30-66 Kmt-Ket 30-6642 Kmt-Ket 33-69, 30-67 30-9810 Kmt-Ket 30-229, 33-70 30-10493 Kw 30-6472 Kw 30-7833 Kw 30-2466 15 Kml 65 Kw 30-6512 55 Kml-Kw 85 Kmt 125 Ket 175 Kwb-Kmv PG-9 Kw 30-8666 39 Kmt 30-6360 Kmt-Ket 30-8365 Kmt-Ket 30-3734 Kmt-Ket 30-6359 120 Ket-Kwb 145 Kmv 30-5964 Ket-Kwb 30-1931 83 Ket-Kwb 114 Kmv 30-3691 105 Ket-Kwb 135 Kmv 30-9248 78 Ket-Kwb 102 Kmv 30-9290 57 Ket-Kwb 88 Kmv 30-10745 Ket-Kwb 30-9639 Ket-Kwb 30-9751 Ket-Kwb 30-2564 Ket 30-2741 Kwb 30-2455 Kwb 30-4252 68 Kwb 80 Kmv 30-9633 Kwb 30-861 Kwb 30-975 Kmv 30-10348 Kmv 33-398 30-8179 Kp3 33-337 Kp3 30-5600 Kp3 33-397 Kp3 30-9697 Kmg 30-7960 Kmg 30-8231 Kmg 30-5266 Kmg 30-9807 Kmg 30-11001 Kmg 30-8739 Kmg 30-8729 Kmg 30-8109 Kmg 30-10684 Kmg 30-8615 Kmg 30-8207 Kmg 30-6517 Kmg 30-5289 Kmg 30-8783 Kmg 30-6520 Kmg 30-10124 Kmg 30-3378 Kmg 30-1063 Kp3 30-514, 33-311 30-513, 33-308 well 45B 30-7979 Kp3 30-2640 Kp3 30-1080, 33-126 30-1234 Kp3 30-8099 Kp3 30-3439 Kp3 30-3438 Kp3 30-1049, 33-139 30-3368 Kp3 30-1046 254 Kp3 497 Kp2 517 OCzu 30-2251 30-3545 Kp3 33-136 Kp3 30-4667 Kp3 30-987 Kp3 30-492 Kp3 30-698 Kp3 30-2580 Kp3 30-6661 Kp3 33-321 Kp3 30-18 Kmg 30-8848 Kp3 30-16 Kmg 30-6210 Kmg 30-6469 Kmg 30-6716 Kmv 30-6717 30-7941 Kmv 30-476 Kp3 30-3013 Kp3 30-10918 Kp3 30-462 Kmv 30-451, 33-115 30-8856 Kmg 30-469, 33-114 30-9179 Kmg 30-7460 Kmg 30-5152 70 Kwb 88 Kmv PG-14 Kwb 30-9268 Kwb PG-11 50 Kw 33-305 50 Ket 90 Kwb 110 Kmv 180 Kmg 33-303 30-1076, 33-395Ket 30-1065, 30-1081, 33-67 30-1086, 33-64 30-9484 30 Kw 80 Kmt-Ket 150 Kwb-Kmv 30-13864 40 Kmt 100 Ket 170 Kwb-Kmv 210 Kmg 30-13862 60 Kw 80 Kmt 125 Ket 185 Kwb-Kmv 30-1467 43 Kml 117 Kw-Kmt-Ket 143 Kwb 30-5150 36 Kml 98 Kw-Kmt 126 Ket PG-2 13 Kns PG-3 6Tkw 30-8779 Kml 30-4434 35 Tht-Kns PG-5 Kns 30-8755 5 Tkw 15 Tvt 53 Tht-Kns 90 Kml 30-7430 30-8731 40 Kw 60 Kmt 30-5337 Kw 30-4489 Kw 30-5427 Kmt 30-7734 Kw 30-9829 Kwb PG-13 Ket-Kwb 30-1253, 33-111 30-2048 30-2049 Kwb 33-93 Kwb 30-1659 Kwb 28-10466, 33-360 30-1322 65 Kwb 90 Kmv 30-1797 Kmv 30-1010, 33-393 30-1033, 33-112 30-1261 Kwb 30-9167 Kwb 30-964 Kp3 27'30" 25' 75 o 22'30" 39 o 45' 42'30" 40' 39 o 37'30" 75 o 22'30" 25' 27'30" 75 o 30' 32'30" 39 o 37'30" 75 o 30' 39 o 45' 7000 FEET 1000 1000 0 2000 3000 4000 5000 6000 .5 1 KILOMETER 1 0 SCALE 1:24 000 1/2 1 0 1 MILE MAGNETIC NORTH APPROXIMATE MEAN DECLINATION, 1993 TRUE NORTH LOCATION IN NEW JERSEY 11.5 O CONTOUR INTERVAL 5 FEET NATIONAL GEODETIC VERTICAL DATUM OF 1929 MARCUS HOOK WOODSTOWN SALEM DELAWARE CITY BEDROCK GEOLOGY OF THE PENNS GROVE AND WILMINGTON SOUTH QUADRANGLES, SALEM AND GLOUCESTER COUNTIES, NEW JERSEY by Scott D. Stanford and Peter J. Sugarman 2006 Geology mapped 2003-2004 Cartography by Scott Stanford and Michael Girard Reviewed by John Jengo, Karl Muessig, Lloyd Mullikin, Kelvin Ramsey Base from U. S. Geological Survey Penns Grove (1995) and Wilmington South (1997) quadrangles Research supported by the U. S. Geological Survey, National Cooperative Geologic Mapping Program, under USGS award number 03HQAG0091. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U. S. Government. DEPARTMENT OF ENVIRONMENTAL PROTECTION LAND USE MANAGEMENT NEW JERSEY GEOLOGICAL SURVEY Prepared in cooperation with the U. S. GEOLOGICAL SURVEY NATIONAL GEOLOGIC MAPPING PROGRAM BEDROCK GEOLOGY OF THE PENNS GROVE AND WILMINGTON SOUTH QUADRANGLES, SALEM AND GLOUCESTER COUNTIES, NEW JERSEY GEOLOGIC MAP SERIES GMS 06-4 200 0 -200 -400 -600 -800 ELEVATION (feet) VERTICAL EXAGGERATION 10X surficial deposits Kp3 Kp2 OCZu A DELAWARE RIVER US ROUTE 130 SECTION BB' 33-139 30-1050 E, G 30-2251 33-311 30-514 E 33-308 30-513 INTERSTATE ROUTE 295 NJ TURNPIKE surficial deposits SALEM RIVER Kp3 Kp2 OCZu BEND IN SECTION surficial deposits Ket Kwb Kmv Kmg Kp3 Kp2 OCZu 30-1065 POINTERS-AUBURN RD 33-64 30-1086 E, G SECTION CC' Tkw Tkw Tvt Tvt Tht Kns Kml Kw Kmt Ket Kwb Kmv Kmg Kp3 Kp2 POINTERS- SWEDESBORO RD A' 200 0 -200 -400 -600 -800 200 0 -200 -400 -600 -800 ELEVATION (feet) C HAINES NECK RD surficial deposits Kml Kw Kmt Ket Kwb Kmv Kmg Kp3 Kp2 OCZu VERTICAL EXA GGERATION 10X BEND IN SECTION SECTION AA' BEND IN SECTION BEND IN SECTION POINTERS-AUBURN RD SALEM RIVER 30-7430 33-64 30-1086 E, G 33-67 30-1081 E 33-395 30-1076 G 33-303 G surficial deposits US ROUTE 40 Kw Kmt Ket Kwb Kmv Kmg Kp3 Kp2 OCZu TWO PENNY RUN BEND IN SECTION 33-69 30-67 G 33-70 30-229 G surficial deposits Kml Kw Kmt Ket Kwb Kmv Kmg Kp3 OCZu C' 200 0 -200 -400 -600 -800 D 200 0 -200 -400 -600 -800 ELEVATION (feet) surficial deposits DELAWARE RIVER DELAWARE DRIVE Kp3 Kp2 OCZu VERTICAL EXAGGERATION 10X SALEM DRIVE FORT MOTT RD NJ ROUTE 49 BEND IN SECTION, SECTION BB' BEND IN SECTION BEND IN SECTION 33-112 30-1033 30-1010 E, G 33-360 28-10466 E Kwb Kmv Kmg Kp3 Kp2 surficial deposits MAHONEY RD COUNTY ROUTE 551 30-2048 E, G 33-111 30-1253 G Kw Kmt Ket Kwb Kmv Kmg Kp3 Kp2 D' 200 0 -200 -400 -600 -800 Kml Kw Kmt Ket Kwb Kmv Kmg Kp3 OCZu UNCONFORMITY UNCONFORMITY UNCONFORMITY UNCONFORMITY Campanian Late Cretaceous Turonian- Coniacian Cenomanian Late Proterozoic-early Paleozoic CORRELATION OF MAP UNITS Kp2 Albian Early Cretaceous UNCONFORMITY? UNCONFORMITY UNCONFORMITY UNCONFORMITY UNCONFORMITY Tkw Tvt Tht Kns Maastrichtian Paleocene Miocene Tertiary INTRODUCTION Bedrock of the Penns Grove and Wilmington South quadrangles includes unconsolidated Coastal Plain formations that overlie metamorphic and igneous basement rocks. The Coastal Plain formations include sand, clay, and glauconite clay laid down in coastal, nearshore marine, and continental-shelf settings between 110 and 20 million years ago (Ma). The underlying metamorphic rocks are much older and were originally laid down as sediments, or intruded as magma, between 700 and 420 million years ago, and compressed and deformed several times. The lithology and age of the formations are provided in the Description of Map Units. Age relations are also summarized in the Correlation of Map Units. Four cross sections show the subsurface geometry of the formations along the line of section. Further details on the regional stratigraphy of the Coastal Plain formations are provided by Owens and others (1998). Surficial deposits of Pliocene and Quaternary age overlie the bedrock formations in most of the map area. The surficial deposits are mapped by Stanford (2006). DESCRIPTION OF MAP UNITS KIRKWOOD FORMATION--Silty clay to silty, very fine sand. Yellow, reddish-yellow, white, light gray. As much as 30 feet thick. The Kirkwood sediments in the map area are within the informal lower member of the Kirkwood Formation (Owens and others, 1998), also known as the Alloway Clay in outcrop in this area (Isphording and Lodding, 1969). The lower member is of early Miocene age (22-21 Ma) based on strontium stable-isotope ratios (Sugarman and others, 1993). Unconformably overlies the Vincentown, Hornerstown, and Navesink formations. VINCENTOWN FORMATION--Glauconitic clayey quartz sand, medium grained. Locally calcareous and fossiliferous, with foraminifera and bryozoan detritus. Glauconite occurs primarily in soft grains of medium sand size. Yellowish-brown, olive, light gray. As much as 40 feet thick. Late Paleocene in age, based on foraminifera (Olsson and Wise, 1997). Unconformably overlies the Hornerstown Formation. HORNERSTOWN FORMATION--Glauconite clay. Olive, green, black where unweathered, olive brown with brown to reddish-brown mottles where weathered. Glauconite occurs primarily in soft grains of fine-to-medium sand size, with botryoidal and accordion shapes. Quartz, mica, feldspar, and phostphatic material also occur as minor constituents. Between 20 and 25 feet thick. Early Paleocene in age based on foraminifera (Olsson and Wise, 1997). Unconformably overlies the Navesink Formation. NAVESINK FORMATION--Glauconite clay to sandy clay. Locally fossiliferous, with calcareous shell beds. Olive, green, black where unweathered; olive brown to olive yellow where weathered. As much as 15 feet thick. Glauconite occurs primarily in soft grains of medium-to-coarse sand size, with botryoidal form. Quartz sand, medium grained, is the principal accessory. Pyrite, mica, and phosphatic material are minor constituents. The basal few feet of the Navesink contain a glauconitic quartz sand with granules and black phosphate pebbles. Late Cretaceous (Maastrichtian) in age based on foraminifera (Olsson, 1964). Strontium stable-isotope age estimates for the Navesink range between 69-67 Ma (Sugarman and others, 1995). Unconformably overlies the Mount Laurel Formation. MOUNT LAUREL FORMATION--Quartz sand, slightly glauconitic, medium grained. Yellowish-brown to reddish-yellow where weathered, gray where unweathered. As much as 70 feet thick in map area. Contains traces of feldspar, mica, and phosphate pebbles. The upper several feet are a coarse sand with granules and pebbles; this interval also contains glauconite from the overlying Navesink Formation concentrated in burrows. Late Cretaceous (late Campanian) in age based on nannoplankton (Sugarman and others, 1995). Grades downward into the Wenonah Formation. WENONAH FORMATION--Quartz sand, micaceous, slightly glauconitic, fine- to very fine-grained. Yellow to very pale brown where weathered, gray to pale olive where unweathered. As much as 40 feet thick. Late Cretaceous (late Campanian) in age based on pollen (Wolfe, 1976) and ammonite fossils (Kennedy and Cobban, 1994). Grades downward into the Marshalltown Formation. MARSHALLTOWN FORMATION--Glauconitic clayey quartz sand, fine- to medium- grained. Olive to dark gray where unweathered, brown to olive brown where weathered. As much as 20 feet thick. Late Cretaceous (middle Campanian) in age, based on nannoplankton (Sugarman and others, 1995). Unconformably overlies the Englishtown Formation. ENGLISHTOWN FORMATION--Quartz sand, fine- to medium-grained, with thin beds of clay and silt. Sand is white, yellow, and light gray where weathered, gray where unweathered. Silt and clay are light gray to brown where weathered, dark gray to black where unweathered. As much as 40 feet thick. Sand contains some lignite and mica and minor amounts of glauconite; silt and clay contain some mica and lignite. Late Cretaceous (early Campanian) in age, based on pollen (Wolfe, 1976). Grades downward into the Woodbury Formation. WOODBURY FORMATION--Clay with minor thin beds of very fine quartz sand. Dark gray and black where unweathered, yellowish brown to brown where weathered. As much as 50 feet thick. Clay is micaceous, with some pyrite and lignite and traces of glauconite. Late Cretaceous (early Campanian) in age based on pollen (Wolfe, 1976). Grades downward into the Merchantville Formation. Minard (1965) includes this clay in the Merchantville or Englishtown formations in the adjacent Woodstown quadrangle. It is mapped separately here because the general absence of sand beds distinguishes it from the overlying Englishtown Formation and the absence of glauconite distinguishes it from the underlying Merchantville Formation. MERCHANTVILLE FORMATION--Glauconitic fine-sandy silty clay to clayey silt. Olive, dark gray, black where unweathered, olive brown to yellowish brown where weathered. As much as 30 feet thick. Glauconite occurs primarily as soft grains of fine- to-medium sand size. Sand fraction is chiefly quartz; feldspar, mica, and pyrite are minor constituents. Iron cementation is common. Late Cretaceous (early Campanian) in age based on ammonite fossils (Owens and others, 1977). Unconformably overlies the Magothy Formation. MAGOTHY FORMATION--Quartz sand, fine- to very coarse-grained, and clay and silt, thin-bedded. Sand is white, yellow, light gray where weathered, gray where unweathered. Clay and silt are white, yellow, brown, rarely reddish-yellow where weathered, gray to black where unweathered. Gray colors are dominant. Sand includes some lignite, pyrite, and minor feldspar and mica. Silt and clay beds include abundant mica and lignite. Late Cretaceous (Turonian-Coniacian) in age based on pollen (Christopher, 1979, 1982; Miller and others, 2004). Unconformably overlies the Potomac Formation. Contact with Potomac Formation placed at change from predominantly gray clay and silt in Magothy Formation to red clay in the Potomac, as reported in well or boring logs, or at increased gamma-ray intensity, decreased electrical resistance, and increased spontaneous potential on geophysical logs, recording the thicker clays in the Potomac. Thickness ranges from 40 to 50 feet over most of the map area, to 150 feet in the northeast corner of the Penns Grove quadrangle. This thickening is due, in part, to erosion of the Potomac Formation before the Magothy was deposited. Regionally, the Magothy thickens, and the Potomac correspondingly thins and pinches out, northeastward along strike in New Jersey (Owens and others, 1998). The upper 10 to 15 feet of the Magothy Formation as mapped here may include the Cheesequake Formation, which has been identified biostratigraphically in coreholes in this region (Miller and others, 2004; Sugarman and others, 2004) but, as a largely non-glauconitic silt, cannot be lithically distinguished from the Magothy based on outcrop and well data in the map area. POTOMAC FORMATION--Quartz sand, fine- to very coarse-grained, and clay and silt, thin- to thick-bedded; minor pebble-to-cobble gravel. Sand is white, yellow, light gray where weathered, gray where unweathered. Clay and silt are white, yellow, brown, reddish-yellow, red where weathered, gray where unweathered. Clay beds are as much as 10 feet thick, sand beds are as much as 50 feet thick. Clay beds are more abundant than sand beds. Total thickness of formation as much as 650 feet in map area. The Potomac Formation in the map area is divided into two informal subunits (Kp3, Kp2) based on pollen zonations (Doyle and Robbins, 1977), although it is not known if the boundary between the units is an unconformity. Unit 3 (Kp3) is of Late Cretaceous (early Cenomanian) age. Unit 2 (Kp2) is present in the subsurface only, and is mapped based on a regionally traceable 30-to-50-foot thick sand at the base of unit 3, as identified in geophysical and lithologic well logs (McKenna and others, 2004; Sugarman and others, 2004). Unit 2 is of Early Cretaceous (Albian) age (Doyle and Robbins, 1977; Owens and others, 1998). The Potomac Formation unconformably overlies Late Proterozoic and early Paleozoic bedrock. LATE PROTEROZOIC AND EARLY PALEOZOIC METAMORPHIC AND IGNEOUS ROCKS--Gray schist and gneiss. Upper 5 to 50 feet is commonly weathered to a brown, red, gray, or greenish gray micaceous sandy clayey saprolite. Of Late Proterozoic and early Paleozoic age. Includes the Wissahickon Formation and related rocks of the Potomac-Philadelphia-Hartland terrane of Late Proterozoic, Cambrian, and Ordovician age (Volkert and others, 1996; Schenck and others, 2000). In subsurface only. MAP SYMBOLS Contact--Approximately located. Formation observed in outcrop, excavation, or hand-auger hole. Well or boring, location accurate to within 200 feet--Number followed by map-unit symbol is depth, in feet below land surface, of base of unit (or total depth of well, if within unit OCZu) as inferred from driller's log or geophysical log (for wells not shown on sections). Map-unit symbol without a depth indicates uppermost formation as inferred from driller's log; for these wells, underlying formations cannot be positively identified. Identifiers of the form 33-xxx are U. S. Geological Survey Ground Water Site Inventory numbers. Identifiers of the form 30-xxxx are N. J. Department of Environmental Protection well permit numbers. Identifiers of the form PG-xx are auger borings drilled by D. S. Powars and J. P. Owens of the U. S. Geological Survey. Well 45B (section BB') is from Leggette, Brashears, and Graham, Inc. (1979). Penns Grove well 2 (section BB') is from Woolman (1902, p. 92). Well or boring, location accurate to within 500 feet--Identifiers and symbols as above. Geophysical log--On sections. "G" indicates gamma-ray log, shown in red, intensity increasing to right. "E" indicates electric log, shown in blue, with spontaneous potential shown on left-hand curve (voltage increasing to right) and resistance shown on right- hand curve (resistance increasing to right). Surficial deposits--On sections, shown where more than 10 feet thick. REFERENCES Christopher, R.A., 1979, Normapolles and triporate pollen assemblages from the Raritan and Magothy Formations (Upper Cretaceous) of New Jersey: Palynology, v. 3, p. 73-121. Christopher, R. A., 1982, The occurrence of the Complexiopollis-Atlantopollis Zone (palynomorphs) in the Eagle Ford Group (Upper Cretaceous) of Texas: Journal of Paleontology, v. 25, p. 525-541. Doyle, J.A., and Robbins, E.I., 1977, Angiosperm pollen zonation of the Cretaceous of the Atlantic Coastal Plain and its application to deep wells in the Salisbury embayment: Palynology, v.1, p. 43-78. Isphording, W. C., and Lodding, W., 1969, Facies changes in sediments of Miocene age in New Jersey, in Subitzky, S., ed., Geology of selected areas in New Jersey and eastern Pennsylvania and guidebook of excursions: New Brunswick, N. J., Rutgers University Press, p. 7-13. Kennedy, W. J., and Cobban, W. A., 1994, Ammonite fauna from the Wenonah Formation (Upper Cretaceous) of New Jersey: Journal of Paleontology, v. 68, no. 1, p. 95-110. Leggette, Brashears, and Graham, Inc., 1979, Progress report of contaminated ground- water recovery system at E. I. DuPont de Nemours and Co., Inc., Chambers Works, Deepwater, N. J. McKenna, T. E., McLaughlin, P. P., and Benson, R. N., 2004, Characterization of the Potomac aquifer, an extremely heterogeneous fluvial system in the Atlantic coastal plain of Delaware: Delaware Geological Survey Open File Report 45, 1 p., 3 plates. Miller, K. W., Sugarman, P. J., Browning, J. V., Kominz, M. A., Olsson, R. K., Feigenson, M. D., and Hernandez, J. C., 2004, Upper Cretaceous sequences and sea-level history, New Jersey Coastal Plain: Geological Society of America Bulletin, v. 116, no. 3- 4, p. 368-393. Minard, J. P., 1965, Geologic map of the Woodstown quadrangle, Gloucester and Salem counties, New Jersey: U. S. Geological Survey Geologic Quadrangle Map GQ-404, scale 1:24,000. Olsson, R. K., 1964, Late Cretaceous planktonic foraminifera from New Jersey and Delaware: Micropaleontology, v. 10, no. 2, p. 157-188. Olsson, R. K., and Wise, S. W., Jr., 1987, Upper Maestrichtian to middle Eocene stratigraphy of the New Jersey slope and coastal plain: Initial reports of the Deep Sea Drilling Project, volume XCII, Washington, D. C., p. 1343-1365. Owens, J. P., Sohl, N. F., and Minard, J. P., 1977, A field guide to Cretaceous and lower Tertiary beds of the Raritan and Salisbury embayments, New Jersey, Delaware, and Maryland: American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists, 113 p. Owens, J. P., Sugarman, P. J., Sohl, N. F., Parker, R. A., Houghton, H. F., Volkert, R. A., Drake, A. A., Jr., Orndorff, R. C., 1998, Bedrock geologic map of central and southern New Jersey: U. S. Geological Survey Miscellaneous Investigations Series Map I-2540-B, scale 1:100,000. Schenck, W. S., Plank, M. O., and Srogi, L., 2000, Bedrock geologic map of the Piedmont of Delaware and adjacent Pennsylvania: Delaware Geological Survey Geologic Map Series 10, scale 1:24,000. Stanford, S. D., 2006, Surficial geology of the Penns Grove and Wilmington South quadrangles, Salem and Gloucester counties, New Jersey: N. J. Geological Survey Geologic Map Series GMS 06-5, scale 1:24,000. Sugarman, P. J., Miller, K. G., Burky, D., and Feigenson, M. D., 1995, Uppermost Campanian-Maestrichtian strontium isotopic, biostratigraphic, and sequence stratigraphic framework of the New Jersey Coastal Plain: Geological Society of America Bulletin, v. 107, p. 19-37. Sugarman, P. J., Miller, K. G., Owens, J. P., and Feigenson, M. D., 1993, Strontium isotope and sequence stratigraphy of the Miocene Kirkwood Formation, southern New Jersey: Geological Society of America Bulletin, v. 105, no. 4, p. 423-436. Sugarman, P. J., Miller, K. G., McLaughlin, P. P., Jr., Browning, J. V., Hernandez, J., Monteverde, D., Uptegrove, J., Baxter, S. J., McKenna, T. E., Andres, A. S., Benson, R. N., Ramsey, K. W., Feigenson, M. D., Olsson, R. K., Brenner, G., and Cobbs, G., III, 2004, Fort Mott site, in Miller, K. G., , Sugarman, P. J., Browning, J. V., and others, eds., Proceedings of the Ocean Drilling Program, Initial Reports, v. 174AX, p. 1-50. Volkert, R. A., Drake, A. A., Jr., Sugarman, P. J., 1996, Geology, geochemistry, and tectonostratigraphic relations of the crystalline basement beneath the Coastal Plain of New Jersey and contiguous areas: U. S. Geological Survey Professional Paper 1565-B, 48 p. Wolfe, J. A., 1976, Stratigraphic distribution of some pollen types from the Campanian and lower Maestrichtian rocks (upper Cretaceous) of the Middle Atlantic States: U.S. Geological Survey Professional Paper 977, 18p., 4 pls. Woolman, Lewis, 1902, Artesian wells: N. J. Geological Survey, Annual Report of the State Geologist for the Year 1901, p. 53-129. Tkw Tvt Tht Kns Kml Kw Kmt Ket Kwb Kmv Kmg Kp3 Kp2 OCZu 30-9247 78 Ket 102 Kwb 30-4748 73 Ket 107 Kwb E, G B 200 0 -200 -400 -600 -800 ELEVATION (feet) VERTICAL EXAGGERATION 10X 33-112 30-1033 E, G SECTION DD' INDUSTRIAL RD surficial deposits Kwb Kmv Kmg Kp3 Kp2 NJ ROUTE 49 NJ ROUTE 49 BEND IN SECTION BEND IN SECTION 33-114 30-476 E 33-115 30-451 E 30-6717 G surficial deposits Kp3 Kp2 OCZu 33--126 30-1080 E 30-2440 INTERSTATE ROUTE 295 SALEM CANAL BEND IN SECTION SECTION AA' well 458 E 33-328 E 33-398 E BEND IN SECTION WHOOPING JOHN CREEK HENBY CREEK BEND IN SECTION WALKER AVE 33-343 E Kp3 Kp2 OCZu surficial deposits Penns Grove well 2 MAIN ST BROAD ST Kp3 OCZu B' 200 0 -200 -400 -600 -800

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Page 1: NJDEP - NJGS - Geologic Map Series GMS 06-4, Bedrock ......47 Kwb 78 Kmv 30-9721 46 Kwb 72 Kmv 30-7532 Kwb 30-2177 Kwb 30-8564 Kwb 30-7543 87 Kwb 30-8946 96 Kmv 70 Kwb 115 Kmv 30-5228

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B'

Kp3

Kmg

Kmg

Kmv

Kmv

Kp3

Kmg

Kmv

Kwb

Kwb

Kwb

Kmv

Kmg

Kmv

Ket

Ket

Kmt

Kmt Kw

Kw

Kmt

Kw

Kml

KmlKmt

Ket

Ket

Kwb

Kmv

Kmg

Kwb

Kmv

Kp3

Kmg

Kp3

Kmg

Kmg

Kmv

Kmv

Kwb

Ket

Kmt Kw

Kmt

Ket

Kw

Kml

Kml

Tkw

Tvt

Tht

Tvt

Tht

Kns

ThtKns

Tht

TvtKns

Kns

TvtTht

Tht

Tvt

Tkw

Tkw

Kns

Kns

TkwTvt

Kml

Kml

Kw

Kmt

Kw

Kmt

Ket

KetKmv

Kwb

Kwb

Kmv

Kmg

C'

A'

CD'B

D

A

30-7693Kp3

30-8433Kp3

PG-13Kp3

30-10134Kp3

30-963Kp3

PG-12Kmg

Penns Grove well 230-467Kp3

30-8119Kp3

30-3381Kp3

30-6723Kp3

30-10762Kmg

30-9600Kmg

30-5768Kmg

30-1772Kmg

30-8393Kmg

30-5842Kmg30-9483

Kmg

30-7118Kmg

30-4708Kmg

30-8177Kmv

30-9028Kwb

30-9449Kmg

30-4403Kmg

30-4308Kwb

30-6602Kwb

30-2656Kwb

PG-15Kwb-Ket

30-5726Kmt

30-860453 Kwb72 Kmv

30-5189Kwb

30-826045 Kwb75 Kmv

30-5063Kwb

30-9881Kwb

PG-7Kwb

30-345415 Ket65 Kwb100 Kmv

30-9378Ket

30-463485 Ket-Kwb103 Kmv

30-1842Ket

30-9041Kwb

30-781323 Kwb52 Kmv

30-9374Kmg

30-4771Kmg30-6522

Kmg30-4661Kmg30-10374

Kp3 30-8768Kmg

30-6729Kmg

30-244KmgPG-6Kmg

30-8530Kmg

30-8017Kp3 30-8261

Kp3

30-9872Kmg

30-10635Kmg

30-527Kp3 30-529

Kp330-563Kp3

30-3535Kp3

30-5310Kp330-526

Kp3

30-8511Kp3

30-5441Kmg

30-266Kmg

30-8149Kp330-1143

Kp333-343

30-8061Kp3

30-620Kp3

30-5287Kp3

30-618Kp3

30-5204Kp3

33-328

30-9191Kp330-9727Kp3

30-9595Kp330-8835

Kp3

30-8190Kp3

30-7608Kmg

30-5339Kmg

30-9165Kmg

33-332Kmg 30-1815

Kmg

30-1113Kmg

30-7104Kmg

30-1064250 Kwb69 Kmv

30-618447 Kwb78 Kmv

30-972146 Kwb72 Kmv

30-7532Kwb

30-2177Kwb

30-8564Kwb

30-754387 Kwb96 Kmv30-8946

70 Kwb115 Kmv

30-522870 Ket-Kwb105 Kmv

30-2747Ket

30-391850Ket95 Kwb129 Kmv

30-76Kwb

30-916961 Kwb70 Kmv

30-899595 Kwb108 Kmv

30-917064 Kwb100 Kmv

30-3858Ket-Kwb

PG-8Kmt

30-852955 Kmt-Ket121 Kwb146 Kmv

30-7065Ket

30-6604110 Kmt-Ket-Kwb145 Kmv

30-5924Kmt-Ket

30-1017967 Ket-kwb105 Kmv

30-759197 Ket-Kwb106 Kmv

30-453270 Ket-Kwb111 Kmv

30-196110 Kmt-Ket-Kwb140 Kmv

30-66Kmt-Ket

30-6642Kmt-Ket

33-69, 30-67

30-9810Kmt-Ket

30-229, 33-70

30-10493Kw

30-6472Kw

30-7833Kw

30-246615 Kml65 Kw 30-6512

55 Kml-Kw85 Kmt125 Ket175 Kwb-Kmv

PG-9Kw

30-866639 Kmt

30-6360Kmt-Ket

30-8365Kmt-Ket

30-3734Kmt-Ket

30-6359120 Ket-Kwb145 Kmv

30-5964Ket-Kwb

30-193183 Ket-Kwb114 Kmv30-3691

105 Ket-Kwb135 Kmv

30-924878 Ket-Kwb102 Kmv

30-929057 Ket-Kwb88 Kmv

30-10745Ket-Kwb

30-9639Ket-Kwb30-9751

Ket-Kwb

30-2564Ket

30-2741Kwb

30-2455Kwb

30-425268 Kwb80 Kmv

30-9633Kwb

30-861Kwb

30-975Kmv30-10348

Kmv

33-398

30-8179Kp3

33-337Kp3

30-5600Kp3

33-397Kp3

30-9697Kmg

30-7960Kmg

30-8231Kmg

30-5266Kmg

30-9807Kmg

30-11001Kmg

30-8739Kmg

30-8729Kmg

30-8109Kmg

30-10684Kmg

30-8615Kmg

30-8207Kmg

30-6517Kmg

30-5289Kmg

30-8783Kmg

30-6520Kmg

30-10124Kmg 30-3378

Kmg

30-1063Kp3

30-514, 33-311

30-513, 33-308

well 45B

30-7979Kp3

30-2640Kp3

30-1080, 33-126

30-1234Kp3

30-8099Kp3

30-3439Kp3

30-3438Kp3

30-1049, 33-139

30-3368Kp3

30-1046254 Kp3497 Kp2517 OCzu

30-2251

30-3545Kp3

33-136Kp3

30-4667Kp330-987Kp330-492

Kp3

30-698Kp3

30-2580Kp3

30-6661Kp3

33-321Kp3

30-18Kmg

30-8848Kp330-16

Kmg

30-6210Kmg

30-6469Kmg

30-6716Kmv 30-6717

30-7941Kmv

30-476Kp3

30-3013Kp3

30-10918Kp3

30-462Kmv30-451, 33-115

30-8856Kmg

30-469, 33-114

30-9179Kmg

30-7460Kmg

30-515270 Kwb88 Kmv

PG-14Kwb

30-9268Kwb

PG-1150 Kw

33-30550 Ket90 Kwb110 Kmv180 Kmg

33-303

30-1076, 33-395Ket

30-1065, 30-1081, 33-67

30-1086, 33-64

30-948430 Kw80 Kmt-Ket150 Kwb-Kmv

30-1386440 Kmt100 Ket170 Kwb-Kmv210 Kmg

30-1386260 Kw80 Kmt125 Ket185 Kwb-Kmv

30-146743 Kml117 Kw-Kmt-Ket143 Kwb

30-515036 Kml98 Kw-Kmt126 Ket

PG-213 Kns

PG-36Tkw

30-8779Kml

30-443435 Tht-Kns

PG-5Kns

30-87555 Tkw15 Tvt53 Tht-Kns90 Kml

30-7430

30-873140 Kw60 Kmt

30-5337Kw

30-4489Kw

30-5427Kmt

30-7734Kw

30-9829Kwb

PG-13Ket-Kwb

30-1253, 33-111

30-204830-2049Kwb

33-93Kwb

30-1659Kwb

28-10466, 33-360

30-132265 Kwb90 Kmv

30-1797Kmv

30-1010, 33-393

30-1033, 33-112

30-1261Kwb

30-9167Kwb

30-964Kp3

27'30" 25' 75o22'30"39o45'

42'30"

40'

39o37'30"75o22'30"25'27'30"75o30'32'30"39o37'30"

75o30'39o45'

7000 FEET1000 10000 2000 3000 4000 5000 6000

.5 1 KILOMETER1 0

SCALE 1:24 0001/ 21 0 1 MILEM

AG

NE

TIC

NO

RT

H

APPROXIMATE MEANDECLINATION, 1993

TR

UE

NO

RT

H

LOCATION IN NEW JERSEY

11.5O

CONTOUR INTERVAL 5 FEET

NATIONAL GEODETIC VERTICAL DATUM OF 1929

MARCUS HOOK

WO

OD

STO

WN

SALEMDELAWARE CITY

BEDROCK GEOLOGY OF THE PENNS GROVE AND WILMINGTON SOUTH QUADRANGLES,

SALEM AND GLOUCESTER COUNTIES, NEW JERSEY

byScott D. Stanford and Peter J. Sugarman

2006

Geology mapped 2003-2004Cartography by Scott Stanford and Michael Girard

Reviewed by John Jengo, Karl Muessig, Lloyd Mullikin, Kelvin Ramsey

Base from U. S. Geological Survey Penns Grove (1995) and Wilmington South (1997) quadrangles

Research supported by the U. S. Geological Survey, National Cooperative Geologic Mapping Program,under USGS award number 03HQAG0091. The views and conclusions contained in this document are

those of the authors and should not be interpreted as necessarily representing the official policies,either expressed or implied, of the U. S. Government.

DEPARTMENT OF ENVIRONMENTAL PROTECTIONLAND USE MANAGEMENTNEW JERSEY GEOLOGICAL SURVEY

Prepared in cooperation with theU. S. GEOLOGICAL SURVEY

NATIONAL GEOLOGIC MAPPING PROGRAM

BEDROCK GEOLOGY OF THE PENNS GROVE AND WILMINGTON SOUTH QUADRANGLES,SALEM AND GLOUCESTER COUNTIES, NEW JERSEY

GEOLOGIC MAP SERIES GMS 06-4

200

0

-200

-400

-600

-800

EL

EVA

TIO

N (

feet

)

VERTICAL EXAGGERATION 10X

surficialdeposits

Kp3

Kp2

OCZu

A

DE

LA

WA

RE

RIV

ER

US

RO

UT

E 1

30

SE

CT

ION

BB

'

33-13930-1050

E, G 30-225133-31130-514

E

33-30830-513 IN

TE

RS

TAT

E R

OU

TE

295

NJ

TU

RN

PIK

E

surficial deposits

SA

LE

M R

IVE

R

Kp3

Kp2

OCZu

BE

ND

INS

EC

TIO

N

surficial depositsKet

Kwb

Kmv

Kmg

Kp3

Kp2

OCZu

30-1065

PO

INT

ER

S-A

UB

UR

N R

D

33-6430-1086

E, G

SE

CT

ION

CC

'

Tkw Tkw

Tvt TvtThtKnsKml

KwKmt

Ket

Kwb

Kmv

Kmg

Kp3

Kp2

PO

INT

ER

S-

SW

ED

ES

BO

RO

RD

A'200

0

-200

-400

-600

-800

200 0

-200

-400

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-800

ELEVATION (feet)

C

HAINES NECK RD

surf

icia

l dep

osi

ts

Km

lK

wK

mt

Ket

Kw

b

Km

v

Km

g

Kp

3

Kp

2

OC

Zu

VE

RT

ICA

L E

XA

GG

ER

AT

ION

10X

BEND IN SECTIONSECTION AA'

BEND IN SECTION

BEND INSECTION

POINTERS-AUBURN RD

SALEM RIVER

30-7

430

33-6

430

-108

6E

, G33

-67

30-1

081

E33

-395

30-1

076

G

33-3

03G

surf

icia

l dep

osi

ts

US ROUTE 40

Kw

Km

tK

et

Kw

b

Km

v

Km

g

Kp

3

Kp

2

OC

Zu

TWO PENNY RUN

BEND INSECTION

33-6

930

-67

G

33-7

030

-229

Gsu

rfic

ial d

epo

sits

Km

l

Kw

Km

tK

et

Kw

b

Km

v

Km

g

Kp

3

OC

Zu

C' 20

0

0 -200

-400

-600

-800

D20

0 0

-200

-400

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-800

ELEVATION (feet)

surf

icia

l dep

osi

ts

DELAWARERIVER

DELAWARE DRIVE

Kp

3

Kp

2

OC

Zu

VE

RT

ICA

L E

XA

GG

ER

AT

ION

10X

SALEM DRIVE

FORT MOTT RD

NJ ROUTE 49

BEND INSECTION,SECTION BB'

BEND INSECTION

BEND INSECTION

33-1

1230

-103

330

-101

0E

, G

33-3

6028

-104

66E

Kw

b

Km

v

Km

g

Kp

3

Kp

2

surf

icia

ld

epo

sits

MAHONEY RD

COUNTY ROUTE 551

30-2

048

E, G

33-1

1130

-125

3G

Kw

Km

tK

et

Kw

bK

mv

Km

g

Kp

3

Kp

2

D' 20

0

0 -200

-400

-600

-800

Kml

Kw

Kmt

Ket

Kwb

Kmv

Kmg

Kp3

OCZu

UNCONFORMITY

UNCONFORMITY

UNCONFORMITY

UNCONFORMITY

Campanian

Late Cretaceous

Turonian-Coniacian

Cenomanian

Late Proterozoic-early Paleozoic

CORRELATION OF MAP UNITS

Kp2 Albian Early Cretaceous

UNCONFORMITY?

UNCONFORMITY

UNCONFORMITY

UNCONFORMITY

UNCONFORMITY

Tkw

Tvt

Tht

Kns Maastrichtian

Paleocene

Miocene

Tertiary

INTRODUCTION

Bedrock of the Penns Grove and Wilmington South quadrangles includes unconsolidated Coastal Plain formations that overlie metamorphic and igneous basement rocks. The Coastal Plain formations include sand, clay, and glauconite clay laid down in coastal, nearshore marine, and continental-shelf settings between 110 and 20 million years ago (Ma). The underlying metamorphic rocks are much older and were originally laid down as sediments, or intruded as magma, between 700 and 420 million years ago, and compressed and deformed several times. The lithology and age of the formations are provided in the Description of Map Units. Age relations are also summarized in the Correlation of Map Units. Four cross sections show the subsurface geometry of the formations along the line of section. Further details on the regional stratigraphy of the Coastal Plain formations are provided by Owens and others (1998). Surficial deposits of Pliocene and Quaternary age overlie the bedrock formations in most of the map area. The surficial deposits are mapped by Stanford (2006).

DESCRIPTION OF MAP UNITS

KIRKWOOD FORMATION--Silty clay to silty, very fine sand. Yellow, reddish-yellow, white, light gray. As much as 30 feet thick. The Kirkwood sediments in the map area are within the informal lower member of the Kirkwood Formation (Owens and others, 1998), also known as the Alloway Clay in outcrop in this area (Isphording and Lodding, 1969). The lower member is of early Miocene age (22-21 Ma) based on strontium stable-isotope ratios (Sugarman and others, 1993). Unconformably overlies the Vincentown, Hornerstown, and Navesink formations.

VINCENTOWN FORMATION--Glauconitic clayey quartz sand, medium grained. Locally calcareous and fossiliferous, with foraminifera and bryozoan detritus. Glauconite occurs primarily in soft grains of medium sand size. Yellowish-brown, olive, light gray. As much as 40 feet thick. Late Paleocene in age, based on foraminifera (Olsson and Wise, 1997). Unconformably overlies the Hornerstown Formation.

HORNERSTOWN FORMATION--Glauconite clay. Olive, green, black where unweathered, olive brown with brown to reddish-brown mottles where weathered. Glauconite occurs primarily in soft grains of fine-to-medium sand size, with botryoidal and accordion shapes. Quartz, mica, feldspar, and phostphatic material also occur as minor constituents. Between 20 and 25 feet thick. Early Paleocene in age based on foraminifera (Olsson and Wise, 1997). Unconformably overlies the Navesink Formation.

NAVESINK FORMATION--Glauconite clay to sandy clay. Locally fossiliferous, with calcareous shell beds. Olive, green, black where unweathered; olive brown to olive yellow where weathered. As much as 15 feet thick. Glauconite occurs primarily in soft grains of medium-to-coarse sand size, with botryoidal form. Quartz sand, medium grained, is the principal accessory. Pyrite, mica, and phosphatic material are minor constituents. The basal few feet of the Navesink contain a glauconitic quartz sand with granules and black phosphate pebbles. Late Cretaceous (Maastrichtian) in age based on foraminifera (Olsson, 1964). Strontium stable-isotope age estimates for the Navesink range between 69-67 Ma (Sugarman and others, 1995). Unconformably overlies the Mount Laurel Formation.

MOUNT LAUREL FORMATION--Quartz sand, slightly glauconitic, medium grained. Yellowish-brown to reddish-yellow where weathered, gray where unweathered. As much as 70 feet thick in map area. Contains traces of feldspar, mica, and phosphate pebbles. The upper several feet are a coarse sand with granules and pebbles; this interval also contains glauconite from the overlying Navesink Formation concentrated in burrows. Late Cretaceous (late Campanian) in age based on nannoplankton (Sugarman and others, 1995). Grades downward into the Wenonah Formation.

WENONAH FORMATION--Quartz sand, micaceous, slightly glauconitic, fine- to very fine-grained. Yellow to very pale brown where weathered, gray to pale olive where unweathered. As much as 40 feet thick. Late Cretaceous (late Campanian) in age based on pollen (Wolfe, 1976) and ammonite fossils (Kennedy and Cobban, 1994). Grades downward into the Marshalltown Formation.

MARSHALLTOWN FORMATION--Glauconitic clayey quartz sand, fine- to medium-grained. Olive to dark gray where unweathered, brown to olive brown where weathered. As much as 20 feet thick. Late Cretaceous (middle Campanian) in age, based on nannoplankton (Sugarman and others, 1995). Unconformably overlies the Englishtown Formation.

ENGLISHTOWN FORMATION--Quartz sand, fine- to medium-grained, with thin beds of clay and silt. Sand is white, yellow, and light gray where weathered, gray where unweathered. Silt and clay are light gray to brown where weathered, dark gray to black where unweathered. As much as 40 feet thick. Sand contains some lignite and mica and minor amounts of glauconite; silt and clay contain some mica and lignite. Late Cretaceous (early Campanian) in age, based on pollen (Wolfe, 1976). Grades downward into the Woodbury Formation.

WOODBURY FORMATION--Clay with minor thin beds of very fine quartz sand. Dark gray and black where unweathered, yellowish brown to brown where weathered. As much as 50 feet thick. Clay is micaceous, with some pyrite and lignite and traces of glauconite. Late Cretaceous (early Campanian) in age based on pollen (Wolfe, 1976). Grades downward into the Merchantville Formation. Minard (1965) includes this clay in the Merchantville or Englishtown formations in the adjacent Woodstown quadrangle. It is mapped separately here because the general absence of sand beds distinguishes it from the overlying Englishtown Formation and the absence of glauconite distinguishes it from the underlying Merchantville Formation.

MERCHANTVILLE FORMATION--Glauconitic fine-sandy silty clay to clayey silt. Olive, dark gray, black where unweathered, olive brown to yellowish brown where weathered. As much as 30 feet thick. Glauconite occurs primarily as soft grains of fine-to-medium sand size. Sand fraction is chiefly quartz; feldspar, mica, and pyrite are minor constituents. Iron cementation is common. Late Cretaceous (early Campanian) in age based on ammonite fossils (Owens and others, 1977). Unconformably overlies the Magothy Formation.

MAGOTHY FORMATION--Quartz sand, fine- to very coarse-grained, and clay and silt, thin-bedded. Sand is white, yellow, light gray where weathered, gray where unweathered. Clay and silt are white, yellow, brown, rarely reddish-yellow where weathered, gray to black where unweathered. Gray colors are dominant. Sand includes some lignite, pyrite, and minor feldspar and mica. Silt and clay beds include abundant mica and lignite. Late Cretaceous (Turonian-Coniacian) in age based on pollen (Christopher, 1979, 1982; Miller and others, 2004). Unconformably overlies the Potomac Formation. Contact with Potomac Formation placed at change from predominantly gray clay and silt in Magothy Formation to red clay in the Potomac, as reported in well or boring logs, or at increased gamma-ray intensity, decreased electrical resistance, and increased spontaneous potential on geophysical logs, recording the thicker clays in the Potomac. Thickness ranges from 40 to 50 feet over most of the map area, to 150 feet in the northeast corner of the Penns Grove quadrangle. This thickening is due, in part, to erosion of the Potomac Formation before the Magothy was deposited. Regionally, the Magothy thickens, and the Potomac correspondingly thins and pinches out, northeastward along strike in New Jersey (Owens and others, 1998). The upper 10 to 15 feet of the Magothy Formation as mapped here may include the Cheesequake Formation, which has been identified biostratigraphically in coreholes in this region (Miller and others, 2004; Sugarman and others, 2004) but, as a largely non-glauconitic silt, cannot be lithically distinguished from the Magothy based on outcrop and well data in the map area.

POTOMAC FORMATION--Quartz sand, fine- to very coarse-grained, and clay and silt, thin- to thick-bedded; minor pebble-to-cobble gravel. Sand is white, yellow, light gray where weathered, gray where unweathered. Clay and silt are white, yellow, brown, reddish-yellow, red where weathered, gray where unweathered. Clay beds are as much as 10 feet thick, sand beds are as much as 50 feet thick. Clay beds are more abundant than sand beds. Total thickness of formation as much as 650 feet in map area. The Potomac Formation in the map area is divided into two informal subunits (Kp3, Kp2) based on pollen zonations (Doyle and Robbins, 1977), although it is not known if the

boundary between the units is an unconformity. Unit 3 (Kp3) is of Late Cretaceous (early Cenomanian) age. Unit 2 (Kp2) is present in the subsurface only, and is mapped based on a regionally traceable 30-to-50-foot thick sand at the base of unit 3, as identified in geophysical and lithologic well logs (McKenna and others, 2004; Sugarman and others, 2004). Unit 2 is of Early Cretaceous (Albian) age (Doyle and Robbins, 1977; Owens and others, 1998). The Potomac Formation unconformably overlies Late Proterozoic and early Paleozoic bedrock.

LATE PROTEROZOIC AND EARLY PALEOZOIC METAMORPHIC AND IGNEOUS ROCKS--Gray schist and gneiss. Upper 5 to 50 feet is commonly weathered to a brown, red, gray, or greenish gray micaceous sandy clayey saprolite. Of Late Proterozoic and early Paleozoic age. Includes the Wissahickon Formation and related rocks of the Potomac-Philadelphia-Hartland terrane of Late Proterozoic, Cambrian, and Ordovician age (Volkert and others, 1996; Schenck and others, 2000). In subsurface only.

MAP SYMBOLS

Contact--Approximately located.

Formation observed in outcrop, excavation, or hand-auger hole.

Well or boring, location accurate to within 200 feet--Number followed by map-unit symbol is depth, in feet below land surface, of base of unit (or total depth of well, if within unit OCZu) as inferred from driller's log or geophysical log (for wells not shown on sections). Map-unit symbol without a depth indicates uppermost formation as inferred from driller's log; for these wells, underlying formations cannot be positively identified. Identifiers of the form 33-xxx are U. S. Geological Survey Ground Water Site Inventory numbers. Identifiers of the form 30-xxxx are N. J. Department of Environmental Protection well permit numbers. Identifiers of the form PG-xx are auger borings drilled by D. S. Powars and J. P. Owens of the U. S. Geological Survey. Well 45B (section BB') is from Leggette, Brashears, and Graham, Inc. (1979). Penns Grove well 2 (section BB') is from Woolman (1902, p. 92).

Well or boring, location accurate to within 500 feet--Identifiers and symbols as above.

Geophysical log--On sections. "G" indicates gamma-ray log, shown in red, intensity increasing to right. "E" indicates electric log, shown in blue, with spontaneous potential shown on left-hand curve (voltage increasing to right) and resistance shown on right-hand curve (resistance increasing to right).

Surficial deposits--On sections, shown where more than 10 feet thick.

REFERENCES

Christopher, R.A., 1979, Normapolles and triporate pollen assemblages from the Raritan and Magothy Formations (Upper Cretaceous) of New Jersey: Palynology, v. 3, p. 73-121.

Christopher, R. A., 1982, The occurrence of the Complexiopollis-Atlantopollis Zone (palynomorphs) in the Eagle Ford Group (Upper Cretaceous) of Texas: Journal of Paleontology, v. 25, p. 525-541.

Doyle, J.A., and Robbins, E.I., 1977, Angiosperm pollen zonation of the Cretaceous of the Atlantic Coastal Plain and its application to deep wells in the Salisbury embayment: Palynology, v.1, p. 43-78.

Isphording, W. C., and Lodding, W., 1969, Facies changes in sediments of Miocene age in New Jersey, in Subitzky, S., ed., Geology of selected areas in New Jersey and eastern Pennsylvania and guidebook of excursions: New Brunswick, N. J., Rutgers University Press, p. 7-13.

Kennedy, W. J., and Cobban, W. A., 1994, Ammonite fauna from the Wenonah Formation (Upper Cretaceous) of New Jersey: Journal of Paleontology, v. 68, no. 1, p. 95-110.

Leggette, Brashears, and Graham, Inc., 1979, Progress report of contaminated ground-water recovery system at E. I. DuPont de Nemours and Co., Inc., Chambers Works, Deepwater, N. J.

McKenna, T. E., McLaughlin, P. P., and Benson, R. N., 2004, Characterization of the Potomac aquifer, an extremely heterogeneous fluvial system in the Atlantic coastal plain of Delaware: Delaware Geological Survey Open File Report 45, 1 p., 3 plates.

Miller, K. W., Sugarman, P. J., Browning, J. V., Kominz, M. A., Olsson, R. K., Feigenson, M. D., and Hernandez, J. C., 2004, Upper Cretaceous sequences and sea-level history, New Jersey Coastal Plain: Geological Society of America Bulletin, v. 116, no. 3-4, p. 368-393.

Minard, J. P., 1965, Geologic map of the Woodstown quadrangle, Gloucester and Salem counties, New Jersey: U. S. Geological Survey Geologic Quadrangle Map GQ-404, scale 1:24,000.

Olsson, R. K., 1964, Late Cretaceous planktonic foraminifera from New Jersey and Delaware: Micropaleontology, v. 10, no. 2, p. 157-188.

Olsson, R. K., and Wise, S. W., Jr., 1987, Upper Maestrichtian to middle Eocene stratigraphy of the New Jersey slope and coastal plain: Initial reports of the Deep Sea Drilling Project, volume XCII, Washington, D. C., p. 1343-1365.

Owens, J. P., Sohl, N. F., and Minard, J. P., 1977, A field guide to Cretaceous and lower Tertiary beds of the Raritan and Salisbury embayments, New Jersey, Delaware, and Maryland: American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists, 113 p.

Owens, J. P., Sugarman, P. J., Sohl, N. F., Parker, R. A., Houghton, H. F., Volkert, R. A., Drake, A. A., Jr., Orndorff, R. C., 1998, Bedrock geologic map of central and southern New Jersey: U. S. Geological Survey Miscellaneous Investigations Series Map I-2540-B, scale 1:100,000.

Schenck, W. S., Plank, M. O., and Srogi, L., 2000, Bedrock geologic map of the Piedmont of Delaware and adjacent Pennsylvania: Delaware Geological Survey Geologic Map Series 10, scale 1:24,000.

Stanford, S. D., 2006, Surficial geology of the Penns Grove and Wilmington South quadrangles, Salem and Gloucester counties, New Jersey: N. J. Geological Survey Geologic Map Series GMS 06-5, scale 1:24,000.

Sugarman, P. J., Miller, K. G., Burky, D., and Feigenson, M. D., 1995, Uppermost Campanian-Maestrichtian strontium isotopic, biostratigraphic, and sequence stratigraphic framework of the New Jersey Coastal Plain: Geological Society of America Bulletin, v. 107, p. 19-37.

Sugarman, P. J., Miller, K. G., Owens, J. P., and Feigenson, M. D., 1993, Strontium isotope and sequence stratigraphy of the Miocene Kirkwood Formation, southern New Jersey: Geological Society of America Bulletin, v. 105, no. 4, p. 423-436.

Sugarman, P. J., Miller, K. G., McLaughlin, P. P., Jr., Browning, J. V., Hernandez, J., Monteverde, D., Uptegrove, J., Baxter, S. J., McKenna, T. E., Andres, A. S., Benson, R. N., Ramsey, K. W., Feigenson, M. D., Olsson, R. K., Brenner, G., and Cobbs, G., III, 2004, Fort Mott site, in Miller, K. G., , Sugarman, P. J., Browning, J. V., and others, eds., Proceedings of the Ocean Drilling Program, Initial Reports, v. 174AX, p. 1-50.

Volkert, R. A., Drake, A. A., Jr., Sugarman, P. J., 1996, Geology, geochemistry, and tectonostratigraphic relations of the crystalline basement beneath the Coastal Plain of New Jersey and contiguous areas: U. S. Geological Survey Professional Paper 1565-B, 48 p.

Wolfe, J. A., 1976, Stratigraphic distribution of some pollen types from the Campanian and lower Maestrichtian rocks (upper Cretaceous) of the Middle Atlantic States: U.S. Geological Survey Professional Paper 977, 18p., 4 pls.

Woolman, Lewis, 1902, Artesian wells: N. J. Geological Survey, Annual Report of the State Geologist for the Year 1901, p. 53-129.

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