· 6 0 0 1 0 £¤ 40 g a m b r i l l p a r k r o a d ... stop 6 stop 9 weverton fm close up view...

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£¤40Gambrill

Park

Road

§̈¦70

$Catoctin Trail (blue)

Yellow Poplar TrailBlack Locust TrailGreen Ash TrailRed Maple TrailWhite Oak Trail

Trails

GAMBRILL STATE PARKMAP OF GEOLOGIC FEATURES

High Knob

Contour interval 20 ft

0 10.25 0.5 0.75 Miles

Ridge

Road

GEOLOGIC UNITSDiabase dike(s)

dark gray to black diabase;weathers to red-brown bouldersJd

Catoctin FormationZcm greenish metamorphosed basalt

Loudoun Formation_Zl

dark gray conglomerates and phyllites;contains white quartz veinsdark gray phyllite (subunit)_Zlp

Weverton Formationmainly gray, metamorphosed sandstones (quartzites),conglomerates and metamorphosed shales (phyllites)

Maryland Heights Member_wm interbedded sandstones/quartzites,

shales and conglomerateslight gray quartzite (subunit)_wmq

_wb sandstones/quartzitesBuzzard Knob Member

Document available online from theMARYLAND GEOLOGICAL SURVEY

www.mgs.md.gov

Stop 3Stop 1

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Stop 9 Weverton Fm close up view

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Stop 7 Bootjack Spring sluice shownStop 15

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GPS coordinates Degrees, dec. min. (NAD 83)

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# Geologic Feature

N Lat W Lon 1 Weverton (Buzzard Knob)

outcrop 39 27.70059 77 29.73260 2 Loudoun outcrop 39 27.68044 77 29.72229 3 Middletown Valley

overlook 39 27.71560 77 29.78080 4 Weverton-Loudoun

contact 39 27.74690 77 29.76408 5 South Frederick Valley

overlook 39 27.82807 77 29.67772 6 North Frederick Valley

overlook 39 28.18785 77 29.65761 7 Bootjack Spring 39 28.37850 77 29.46606 8 Weverton-Loudoun

contact 39 28.25407 77 29.52286 9 Weverton

(Buzzard Knob) cliff 39 29.02927 77 30.08253 10 Weverton (Buzzard Knob)

outcrop 39 29.14803 77 29.97088 11 Loudoun outcrop 39 29.08658 77 29.75662 12 Loudoun outcrop 39 29.07696 77 29.81639 13 Loudoun-Weverton

contact 39 27.73073 77 29.43834

14 Buzzard Knob- Maryland Heights contact 39 27.82149 77 29.28180

15 Maryland Heights - quartzite subunit contact 39 27.81866 77 29.17985

16 Maryland Heights- Buzzard Knob contact 39 27.94981 77 29.18700

17 Loudoun-Weverton contact 39 28.01713 77 29.33200

18 Loudoun-Weverton contact 39 27.93573 77 29.38417