GMS 18-2, Geologic Map of the New Jersey Portion of the Lumberville

DEPARTMENT OF ENVIRONMENTAL PROTECTION Prepared in cooperation with the GEOLOGIC MAP OF THE NEW JERSEY PORTION WATER RESOURCES MANAGEMENT U.S. GEOLOGICAL SURVEY OF THE LUMBERVILLE QUADRANGLE NEW JERSEY GEOLOGICAL AND WATER SURVEY NATIONAL GEOLOGIC MAPPING PROGRAM HUNTERDON COUNTY, NEW JERSEY GEOLOGIC MAP SERIES GMS 18-2 N FRENCHTOWN PITTSTOWN 75o05’00 75o02’0 75o00’ o o 0 0’00 A 0 0’00 Contour Plot ately sorted, weakly stratified. Deposits along Lockatong Creek are chiefly flag- 8 5 7 8 7 INTRODUCTION CORRELATION OF MAP UNITS Qe p Qal p 9 D F Fishing 6 8 p 16 R 200 7 4 D stone gravel composed of gray and red mudstone, with a matrix of reddish-brown FARM Qcs 8 11 14 L RD 8 4 40 R 12 The Lumberville 7.5-minute topographic quadrangle lies within the Piedmont R 300 L Island Qw 4 8 10 Qcal 10 Qcal 0 p Qcal E U Qst 4 N 10 to grayish-brown silt, and are generally less than 10 feet thick. They form terraces H 50 M S 5 0 O 6 SURFICIAL 2 8 I physiographic province, Hunterdon County, west central New Jersey and Bucks E 300 Qal 5 6 HO 4 6 R N 5 to 10 feet above the modern floodplain and are likely of late Wisconsinan age. T Qcal SES Percent D T 10 H U R O 500 per 1% area County, Pennsylvania. The region has not succumbed to the “growing” pressures E Qcal pg E p K T 9 B Deposits along the Delaware River are chiefly yellowish-brown silt and fine sand L 6 5 E Qcal Qal A Holocene N 5 10 15 from suburban development and continues to maintain a rural character. The Del- Qcal D W 7 R as much as 25 feet thick that form a terrace 15 to 20 feet above the modern flood- E p D P Qcal Qa Qal Qcal p aware River bisects the quadrangle in a north-south direction before swinging in a O 5 plain. They rest on a strath cut into the glaciofluvial gravel (unit Qwf) and so are of R C E 8 12 FAIRVIEW RD more easterly direction down stream. N Qst T 7 0 postglacial age. E Qcal 50 0 5 R 00 pg 0 2 T lateR Pleistocene 7 1 0 1 0 D H p 200 0 10 pg 5 A 0 The bedrock geology controls the variable topography in the quadrangle. The Qe p T Qw C 11 Shale, Sandstone, and Mudstone Colluvium - Silt, sandy silt, clayey silt, red- 300 Qcal H Hunterdon Plateau occupies the northern section of the quadrangle with topo- Qcs E Qcs Qal R dish-brown to yellowish-brown, with some to many subangular flagstones, chips, erosion Qcs p 300 pg 2a graphic elevations ranging from about 400 to 500 feet. The surface water drainage Qal p R TINICUM D N = 35 and pebbles of red and gray shale, mudstone, and minor sandstone. Poorly sorted, 200 CRE Qst D patterns on the plateau dominantly align in a northeast-southwest direction which 300 E Qcal pg Qcal KE R Diabase Qi middle Pleistocene 2 DY nonstratified to weakly stratified. Flagstones and chips have strong slope-parallel N Camp 8 pg P Qal 00 L 0 O parallels the bedrock strike. Lockatong Creek transects the plateau with a south- 4 R 0 alignment of a-b planes. The unit is as much as 30 feet thick and forms footslope A 1 Wilson 7 9 N erosion D pg E wardly trend and drains into the Delaware River. Abundant rock ledges frequently C Qcal aprons along base of hillslopes. It is chiefly of late Wisconsinan age. early Pleistocene- HIDDEN crop out along its banks. The quadrangle has more muted topography in the south 0 Qw Qcal Qps 0 Contour Plot 3 5 Pliocene 10 with topographic elevations ranging from about 100 to 200 feet. D N pg BREEZE R 8 NT L D Marshall OI Eolian Deposits - Silt and very fine-to-fine sand, reddish yellow. Well-sorted, non- Qcal ERTOWN P 8 6 R RB Qe BA n Y 4 T Barbertown R stratified. As much as 3 feet thick. These are windblown deposits blown from the Y i Island Qcs 8 p u 2 E n B U BEDROC D i pg 13 R Percent c 0 L R u r The bedrock within the Mesozoic-aged Newark basin was formed by the depo- m C E B 0 L p D R L y per 1% area N 9 ION N 1 STAT glaciofluvial plain in the Delaware River valley. A R D WOO L d Qw KING A V O I sition of sediments and subsequent intrusion of magma within a half-graben rift 0 7 d T NEWAR BASIN Vansant H 0 S E 3 2 Qal 7 u S 0 W L G 0 O N M basin formed during the breakup of the Pangea supercontinent. The Newark basin D Airport L 0 5 10 15 I 0 L Qal Pinkertons Island 12 4 Late Wisconsinan Glaciofluvial Deposit - Pebble-to-cobble gravel and pebbly R O 13 pg Qcal H Qal 0 Qcs is filled with Triassic-Jurassic sedimentary and igneous rocks that have been tilted, Qwf 0 0 0 sand, moderately to well-sorted and stratified. Sand is yellowish brown, brown, 1 4 faulted, and locally folded (Schlische, 1992; and Olsen and others, 1996). Most 9 light gray. Gravel includes chiefly red and gray mudstone and sandstone; gray, STA 5 10 M Qcal U JURASSIC 0 tectonic deformation is probably Late Triassic to Middle Jurassic age (Lucas and C Qal D AF 0 Shyhawks Island 9 ong l t C D white, and purplish-red quartzite and conglomerate; and some gray and white FER Cr 1 ka r T T oc Y others, 1988; de Boer and Clifford, 1988). Southeast-dipping normal faults along Sundale Y R 200 inicum Qst L D Qal 5 7 p R gneiss and dark-gray chert. Gneiss clasts are unweathered or have a very thin 0 U 0 12 N D p 15 the basin’s northwestern margin primarily influenced the basin morphology, sed- 1 0 0 R Walls 0 weathered rind. It is as much as 40 feet thick and forms an eroded plain in the J d R 0 3 Qal D iment deposition patterns, and the orientation of secondary structures within the 3 Y 9 r 2b R Island I 13 Delaware River valley with a top surface between 30-60 feet above the modern O e Qcal B 8 N = 199 A 0 11 A 8 O v basin. Episodic, periodic motion on these faults also influenced the position where OLLOW RD 0 C Qcs R Passaic Formation i H T 1 C floodplain. Deposited by glacial meltwater descending the Delaware River valley RK C A N 6 R sediment was input to the basin from the Highlands to the northwest, and resulted D N R O E U S 7 F O 9 T during the late Wisconsinan glaciation. Frankenfield Covered Bridge 0 O e R M 0 K N in having a general sediment dispersal pattern parallel to the basin’s long axis r D DQUARTE 3 C D K p D EA RS a 11 R H R 2 R Qcs N Q U (northeast-southwest). Intrabasinal faulting also occurred during active deposition D 00 W E w 5 Contour Plot Illinoian Glaciofluvial Deposit - Pebble-to-cobble gravel, silty sand, sandy silt, U Qal B TO a A T K (Schlische, 1992, 1993). Differential fault slip along individual segments of the N l C Qif I L O l 14 L N e L R 13 moderately to poorly sorted and stratified. Matrix is reddish-brown to brown. Grav- 0 pg L E Intrusive Contact U D Qcal 12 0 11 O8 border and intrabasinal fault systems resulted in having a series of depressions N M D 9 O 10 0 2 500 I 0 H W el includes chiefly red and gray mudstone and sandstone; gray, purplish-red, and E 2 pg G 6 H N (synforms) and ridges (antiforms) oriented normal to the fault trends along their X 9 p KI 4 E pg r lr 2 white quartzite and conglomerate; and some gray and white gneiss and dark gray D Treasure C Percent p 10 length (Schlische, 1995). Sediment thickening into the fold troughs indicates the Smithtown Qal d RD per 1% area chert. Gneiss and sandstone clasts have thick weathered rinds or are decom- n Island r RD Lily █ fo FO Qcal syndepositional nature of these regional fold structures. Tectonic deformation and 300 r AR lr TRIASSIC 0 18 8 a W 5 10 15 20 posed. As much as 20 feet thick. Forms terrace remnants in the Delaware River 0 Qst W Conormable Valley 2 10 synchronous sedimentation continued into the Middle Jurassic at which time ex- B 300 Qa Qal Fly-N-D valley with a top surface between up to 100 feet above the modern floodplain. Hoge 8 Qcs Eagles A R pg 8 Kingwood tensional faulting and associated tilting and folding ceased. At this stage, the basin lh Farm Airport pg B Landing Strip Airport M Lair Airport E Deposited by glacial meltwater descending the Delaware River valley during the 30 1 0 U 0 0 R 0 3 l likely experienced a period of post-rift contractional deformation and localized ba- N T I 0 Qcs C 0 O Illinoian glaciation.

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