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Jd
_wm
_wm
_wb _wm
_wb
_wb
Zcm
_wb
_wm
_wm
Zcm _wb
Zcm
_Zl
_wb
_wmq
_Zlp
_Zlp
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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
Stop 6
Stop 9 Weverton Fm close up view
Stop 4
Stop 7 Bootjack Spring sluice shownStop 15
Stop 2
GPS coordinates Degrees, dec. min. (NAD 83)
Stop
# 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
