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93°00'30°30'

15'

30°00'93°0015'30'

45'94°00'

30°00'

15'

94°00'30°30' 45' 30' 15'

SCALE 1:100,000Base map from U.S. Geological Survey 1:100,000 Digital Line Graphs (100K DLG)

Universal Transverse Mercator Projection, Zone 151927 North American Datum (NAD 27)

Contour Interval 10 metersNational Geodetic Vertical Datum 1929

1 0

0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Kilometers

1 21 43 65 87 109 1211 13Miles

LAKE CHARLES, LOUISIANA/TEXAS30093-A1-TM - 100K

LAKE CHARLES, LOUISIANA/TEXAS 30 x 60 MINUTE GEOLOGIC QUADRANGLE SERIES

Correlation of Map Units Calcasieu

River valleySabine

River valley coastal plain

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Lake Charles 30 x 60 Minute Geologic Quadrangle2002

Produced and published by the Louisiana Geological Survey208 Howe-Russell Geoscience Complex, Louisiana State UniversityP.O. Box G, Baton Rouge, LA 70893 • 225/578-5320 • www.lgs.lsu.edu

Production of this map was supported by the U.S. Geological Survey,Department of the Interior under Assistance Award No. 1434-HQ-96-AG-01490.

Copyright ©2002 by the Louisiana Geological Survey

Geology by:Paul Heinrich, John Snead, and Richard P. McCulloh

GIS compilation by:R. Hampton Peele, Edwin Millet, Vishweshwar Admal, Anuradha Eragani, Swathi Kambalapally,Pratyush Kumar, and Weiwen Feng

Cartography by:Edwin Millet and John Snead

New Roads

Crowley

30°

32°

94° 92° 90°

0 50 miles

Amite Bogalusa

Gulfport

Ville Platte

Ponchatoula

L O U I S I A N A

Published (2002) In preparation

30 x 60 Minute Geologic Quadrangles

Lake Charles

De Ridder

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Description of Map Units

HOLOCENE

Holocene unnamed alluvium, undifferentiated—alluvial deposits of minor streams and creeks filling valleys cut into older deposits. The modern flood plain within these valleys constitutes the surface of the deposits. The lithology of these alluvial deposits reflects the reworked lithology of their adjacent source.

Small river deposits, undifferentiated—undifferentiated alluvium of small coastal rivers, consisting of recognizable but unmapped channel and overbank deposits within the Calcasieu River valley.

Small river meander-belt deposits—point-bar and associated overbank deposits underlying meander belts of the Sabine River. The surface of the meander belt. Is characterized by ridge and swale topography. These deposits typically consist of gray to reddish brown sand, silt, silty clay, and sandy clay.

Backswamp deposits—Fine-grained Holocene backswamp deposits of the Sabine River, underlying flood basins between meander belts. These sediments consist of dark reddish brown to dark gray or black silty clay or clay.

Mermentau Alloformation—Complexly interfingering and interbedded, dark-colored marine muds, sandy and shelly beach deposits, organic marsh clays, and lacustrine and bay muds. These deposits bury the surfaces of the Prairie and Deweyville Allogroups. The Louisiana chenier plain forms the surface of the Mermentau Alloformation. The Alloformation extends westward along the coast into Texas as far west as Galveston Bay. Eastward, it extends almost to the west shore of Vermilion Bay, where it interfingers with deltaic sediments of the Teche delta lobe. Seaward of the shoreline, the Mermentau Alloformation grades laterally into unnamed marine sediments.

PLEISTOCENE

DEWEYVILLE ALLOGROUP

Deweyville Allogroup, undifferentiated—alluvial deposits of ancestral late Pleistocene coastal plain streams and certain Mississippi River tributaries. In the Lake Charles quadrangle, these include the Sabine and Calcasieu river valleys. Multiple levels are locally recognized and delineated where applicable. Surface morphology can be veneered by younger alluvium. The surface of the Deweyville Allogroup is topographically inset into the Prairie Allogroup or older deposits and is characterized by meander scars substantially larger than those of modern stream flood plains. Surface deposits are generally sandy and grade to sandy and gravelly channel and point-bar deposits.

Fredonia alloformation—youngest alloformation and topographically lowest surface of the Deweyville Allogroup along the Sabine River. It lies near the level of the Sabine River flood plain and is mostly buried by it. At Deweyville, Texas, the Fredonia alloformation lies at the level of and is largely buried by sediments of the Sabine River flood plain.

Sandjack alloformation—alloformation of the Deweyville Allogroup along the Sabine River that is intermediate in age and topographic position between the Merryville and Fredonia alloformations. Deweyville Texas lies on the surface of the Sandjack alloformation.

Merryville allformation—oldest alloformation and topographically highest surface of the Deweyville Allogroup along the Sabine River. The terrace of the Merryville alloformation lies on the Louisiana side of the Sabine River Valley directly across from Deweyville, Texas.

PRAIRIE ALLOGROUP

Prairie Allogroup, undifferentiated—a diverse depositional sequence of late to middle Pleistocene deposits of the Mississippi River, its tributaries, and coastal plain streams. Includes terraced fluvial (meander belt, backswamp, and braided-stream), colluvial, estuarine, deltaic, and marine units deposited over a considerable interval of the late Pleistocene (Wisconsin to Sangamon). Surfaces generally show little dissection and are topographically higher than the Deweyville. Multiple terrace levels are recognized along alluvial valleys and coast-parallel trends. The Prairie is locally mapped as undifferentiated alluvial terraces where discontinuous surfaces are incised into older allogroups within valleys. The allogroup is divided into two temporal depositional phases: Late Sangamon and Early Sangamon

Prairie Allogroup, Early Sangamon—a diverse depositional sequence of flood plain, meander belt, and backswamp deposits of the middle Pleistocene ancestral Mississippi River, Red River, local fluvial equivalents of tributary streams, and coastal plain streams. Older and topographically higher of the Prairie Allogroup temporal phases. Where this unit is mapped near the Mississippi River flood plain, it is blanketed by both Peoria and Sicily Island Loess or by loess-derived colluvium. The unit dips into the subsurface beneath the Pleistocene Prairie Allogroup, Late Sangamon in the coast-parallel region, but is commonly terraced above it in stream valleys. The sediments are generally clay, silty clay loam, or sandy clay loam and grade to sand and gravel.

Beaumont Alloformation—coastal plain deposits of late to middle Pleistocene streams; the oldest alloformation and topographically highest surface of the Prairie Allogroup units of southwestern Louisiana. It exhibits the relict channels of the Red and Calcasieu rivers, and includes deposits of the Ingleside barrier trend within the Lake Charles quadrangle.

relict Pleistocene coastal ridges—low-lying ridges delineated on the surface of the Beaumont Alloformation. Some of these ridges are coast-parallel and others trend obliquely to the coast and radiate from the end of known meander belts. In the southeast portion of the Lake Charles quadrangle, limited drilling indicates that these ridges are either meander-belt ridges or deltaic distributaries of differing ages. The origins of other coastal ridges within the Lake Charles quadrangle remain undetermined.

relict Pleistocene barrier ridge (Houston ridge)—eastern segment of the Ingleside barrier trend of Texas; ridge delineated on the surface of the Beaumont Alloformation.

INTERMEDIATE ALLOGROUP

Intermediate allogroup, undifferentiated—fluvial deposits of the Sabine and Calcasieu Rivers, their tributaries, and coastal plain streams. The deposits of the Prairie Allogroup onlap the surfaces of the Intermediate allogroup within the Lake Charles quadrangle. Within the DeRidder quadrangle to the north, the surfaces of the Intermediate allogroup lie below the topography of the adjoining Upland allogroup and Tertiary formations. The Intermediate allogroup surfaces are generally dissected and lack distinct constructional topography. The Intermediate is locally mapped as undifferentiated alluvial terraces where discontinuous surfaces are incised into older allogroups within valleys.

Oakdale alloformation—alluvial deposits of middle Pleistocene streams in southwestern Louisiana, lying in elevation below the higher surfaces of the Intermediate and Upland allogroups and above the Prairie Allogroup, Early Sangamon. The surface is highly dissected and lacks any constructional topography. Near the Mississippi River flood plain, the unit is blanketed by Sicily Island Loess, which is overlain by less than 1 meter of Peoria Loess in places southwest of where the flood plain is joined by that of the Red River. Previously it has been designated as the Oberlin surface in southwestern Louisiana.

Lissie Alloformation, undifferentiated—dissected alluvial deposits of early Pleistocene streams. The regionally extensive Upland geosol occurs at the top of the unit. The unit is bounded updip by the Willis Formation and downdip by younger subunits of the Intermediate allogroup and the Prairie Allogroup. Near the Mississippi River flood plain, the unit is blanketed by Sicily Island Loess. Recognition in the area encompassing the Lake Charles quadrangle is facilitated by the subregionally extensive De Ridder surface. Within the Lake Charles quadrangle, the Dequincy fault-line scarp offsets the surface of the Lissie Alloformation. Previously designated as the Bentley terrace in southwestern Louisiana.

Open Water

Contact—dashed where inferred.

Fault—dashed where inferred; dotted where concealed.

Streams

Topographic contours

Roads

Railroads

Area uplifted by salt dome

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1934

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 or the state of Louisiana.

This map has been carefully prepared from the best existing sources available at the time of preparation. However, the Louisiana Geological Survey and Louisiana State University do not assume responsibility or liability for any reliance thereon. This information is provided with the understanding that it is not guaranteed to be correct or complete, and conclusions drawn from such data are the sole responsibility of the user. These regional geologic quadrangles are intended for use at the scale of 1:100,000. A detailed on-the-ground survey and analysis of a specific site may differ from these maps.

Chacko J. JohnDirector & State Geologist