S10947

60

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7000 FEET1000 10000 2000 3000 4000 5000 6000

.5 1 KILOMETER1 0

SCALE 1:24 0001/ 21 0 1 MILE

MN N

1981 MAGNETIC NORTH DECLINATION AT CENTER

OF SHEET IS 11.5o LOCATION IN NEW JERSEY

74o30'40o22'30"

32'30"35'74o37'30"40o22'30"

20'

17'30"

40o15'74o37'30" 35' 32'30" 74o30'

40o15'

17'30"

20'

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28-406428-2-880

28-2-880

28-2-887

28-2-888

HT-4

HT-5

27-332128-19204

28-1925

28-927

28-1486728-8600

28-20103

28-20102

28-4346

28-6103

28-4343

28-2168

15

60

30

22

2226

74

>5168

40>50

48

13

30>70

40

43

130120

0

20

40

60

80

100

28-328228-2176

28-2344

28-8348

28-10010

28-4965

28-5203

28-12271

28-1303728-21224

W41W44

W7

WI

W42

W43 WV

W14

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W11

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95>100

74

63

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687979

47>35

4843

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4070

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64

32

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54

78

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75

67

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79

79

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456463

35

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W2

W6

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W4

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6259

52

54

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50

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65 65

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51

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28-6210

28-6056

28-1204628-681828-7792

28-6559

28-715128-8784

28-1985

52

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30

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28-9289

28-11851

28-14378

28-1856128-16833

28-13073

28-11754

28-15319

28-13746

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28-13068

28-1345028-13083

28-1021728-12035

28-12359

28-12574

28-2986

28-12739

28-12025

28-4910

28-244028-690

28-7187

28-2094

28-890

28-12694

28-10460

28-142328-8881

28-8008

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28-1147728-5019

28-6086

28-4951

28-6143

28-7021

28-4330 28-712028-1228428-5955

28-695077

726370

93

7857

8075

7528-700750

10

28-622628-5015

28-1989

28-2374

28-198628-3460

28-5351

28-5061

20

2828

55

24

24

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28-11075

28-11716

28-998528-21338

28-13825

28-4941

28-496128-5501

28-7523

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74

83

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28-8863

28-1804528-7839

28-6237

25

7975

65

23-791

28-12136

28-9835

28-9795

S102

S101

S103

S104

S105

28-11501

28-143028-1304728-18517

28-15572

28-1397628-15267

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S108

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28-971

28-665428-1396

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28-1091970 >65

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28-3371

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28-4876

28-9328

28-5199

28-20915

28-18282

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38

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65

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71

82

77

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19

25

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2921

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28-5781

28-3483

28-3535

28-3067

28-136428-5784

28-5302

2050

10752

51

73

32

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S111

S112

S113

S114

S115

S116

S117

S26A

28-6117

S25A

S24A

S23A

28-13701

28-706128-12476

28-15179

21-17521-25

8

2433

34

38

35

40

68

60

6763

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22

22

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11

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28-6861

28-599328-10999

28-4873

28-1559

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28-4232

28-13255

28-1243738

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28-4589

28-1378

28-12003

28-9457

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28-18942

28-18560

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28-6944

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28-922

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S84

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S81

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28-10532

28-10991

28-16723

28-9641

28-13138

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28-1393428-12434

28-14150

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40

60

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80

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0

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0

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40

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60

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80

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100

28-2487

28-5649

21-241

28-126528-1395

28-247728-252

28-1515

28-4352

28-1498

28-5079

28-496728-1455

28-5780 28-7337

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80

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71>71

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72

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5928-1499

28-4689

28-4979

28-8221 28-7768

28-13193

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S119

S118

S121

S122

S123

S124

S125

S126

S127

28-1274

74

>82

59

20

44

27

37

37

41

9

61

85>82

60

58

6521-152

32

18

S128

S129

S130

S131

S132

28-4875

20

19

14

19

0

31

Tp

Tp

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Tp

Qal

Tp

Qal

TpQtl

Tp

Tp

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Tp

Tp

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Qwcp

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Qwcp

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Tp

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QtlQal

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Tp

Tpg

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CONTOUR INTERVAL 20 FEETNATIONAL GEODETIC VERTICAL DATUM OF 1929

SURFICIAL GEOLOGY OF THE HIGHTSTOWN QUADRANGLE,MIDDLESEX AND MERCER COUNTIES, NEW JERSEY

byScott D. Stanford

2002

MAP UNITSAge of unit indicated in parentheses. For units spanning more than one period, principal age is listed first.

Order of map units in list does not necessarly indicate chronologic sequence.

ARTIFICIAL FILL--Sand, silt, clay, gravel; brown, gray, yellowish brown; may include demolition debris (concrete, brick, asphalt, glass) and trash. As much as 20 feet thick. Many small areas of fill in urban areas are not shown.

ALLUVIUM (Holocene and late Pleistocene)--Sand, silt, clay, peat; yellowish brown, dark brown, gray; and pebble gravel. Abundant organic matter. Sand is chiefly quartz, with some glauconite and mica. Gravel is quartz and quartzite with minor ironstone. As much as 20 feet thick. Deposited in floodplains, channels, and groundwater seepage areas.

SWAMP AND MARSH DEPOSITS (Holocene and late Pleistocene)--Peat and organic silt, sand, and clay; dark brown to black. As much as 10 feet thick.

COLLUVIUM AND ALLUVIUM (Holocene and late Pleistocene)--Interbedded alluvium and colluvium in headwater valleys. As much as 10 feet thick.

EOLIAN DEPOSITS (late Pleistocene and Holocene)--Fine sand and silt, very pale brown to reddish yellow. Sand is chiefly quartz with minor shale fragments, glauconite, and mica in places. As much as 6 feet thick. Shown as an overprint pattern where generally continuous but less than 3 feet thick.

LOWER TERRACE DEPOSITS (late Pleistocene)--Sand and minor silt; yellow, yellowish brown, reddish yellow; and pebble gravel. Sand is chiefly quartz with some glauconite and mica. Gravel is quartz and quartzite with minor ironstone. Adjacent to Carnegie Lake, gravel includes some gray siltstone and minor red siltstone and gray gneiss. As much as 30 feet thick. Forms stream terraces with surfaces 5 to 20 feet above the modern floodplain.

LOWER COLLUVIUM (late Pleistocene)--Sand, silt, minor clay; yellow, yellowish brown, reddish yellow, light gray; some quartz and ironstone pebbles. As much as 10 feet thick. Forms aprons graded to lower terraces or the modern floodplain,

UPPER TERRACE DEPOSITS (middle Pleistocene)--Sand and minor silt; yellow, reddish yellow; and pebble gravel. Sand is chiefly quartz; glauconite and mica are less abundant than in the lower terrace deposits and alluvium. Gravel is quartz, quartzite, and minor ironstone. As much as 20 feet thick. Forms stream terraces with surfaces 20 to 30 feet above the modern floodplain.

PENSAUKEN FORMATION (Pliocene)--Sand, minor silt and clay; yellow to reddish yellow; pebble gravel and minor cobble gravel, particularly at the base of the deposit. Sand is chiefly quartz with some weathered feldspar and minor glauconite and mica. Gravel is chiefly quartz and quartzite with some chert and ironstone, and minor amounts of deeply weathered sandstone, mudstone, diabase, and gneiss. Locally iron-cemented. Locally includes beds of dark-gray to reddish-yellow clay as much as 6 feet thick. As much as 140 feet thick. In erosional remnants of a dissected river plain.

PENSAUKEN FORMATION, GLAUCONITIC PHASE (Pliocene)--Sand, minor silt and clay; reddish yellow to yellowish brown; and pebble gravel. Sand is chiefly quartz with some glauconite and mica and minor feldspar. Gravel is chiefly quartz and quartzite with some chert. As much as 20 feet thick. A phase of the Pensauken Formation deposited by tributaries from the Coastal Plain.

WEATHERED COASTAL PLAIN FORMATIONS--Exposed sand and clay of Coastal Plain bedrock formations. May be overlain by thin, patchy alluvium and colluvium. Quartz, chert, and ironstone pebbles left from erosion of surficial deposits may be present on the surface and in the upper several feet of the formation.

WEATHERED SHALE AND SANDSTONE--Silty clay to sandy silt; reddish brown, pale red, reddish yellow, gray; with few to some angular pebble- and cobble-sized fragments of siltstone and sandstone, and a few quartz, chert, and ironstone pebbles left from erosion of surficial deposits. As much as 30 feet thick.

MAP SYMBOLS

Contact--Contacts of alluvium and swamp deposits are well-defined by landforms and are drawn from 1:12,000 scale aerial stereophotos. Contacts of other units are approximately located based on both landforms and field observation points.

Material observed in hand-auger hole, exposure, or excavation.

Shallow topographic basin--Of probable periglacial origin.

Well or boring--Upper number (italicized) is identifier, lower number is thickness of surficial material, in feet. Identifiers of the form '28-xxxx' are N. J. Department of Environmental Protection well permit numbers. Identifiers of the form '23-xxx' and '21-xxx' are from Gronberg, J. M., Birkelo, B. A., and Pucci, A. A., 1989, Selected borehole geophysical logs and drillers' logs, northern Coastal Plain of New Jersey: U. S. Geological Survey Open-File Report 87-243, 133 p. Identifiers of the form 'Sxx' and 'Wxx' are borings made for a proposed ship canal in the 1930s, and for sand-resource exploration, respectively. Logs of these borings are on file at the N.J. Geological Survey. Identifiers of the form 'HT4' are borings made by J. P. Owens and D. S. Powars of the U. S. Geological Survey in 1991 as part of a regional cooperative geologic mapping project with the N. J. Geological Survey.

Elevation of base of Pensauken Formation--In feet above sea level. Contour interval 20 feet. Dashed where eroded.

Paleocurrent measurement--Arrow indicates paleoflow direction, "x" indicates location of measurement. Measurements made on tabular, planar cross beds.

Thin eolian deposits--Veneer of fine sand and silt, generally less than 3 feet thick.

Bedrock strike ridge--Low ridge parallel to strike of bedrock. Drawn from airphotos.

x

MONMOUTH JUNCTIONPR

INC

ETO

N

ALLENTOWN

JAM

ESB

UR

G

Base from U. S. Geological Survey, 1954Photorevised 1981

Geology mapped 1991

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DEPARTMENT OF ENVIRONMENTAL PROTECTIONNEW JERSEY GEOLOGICAL SURVEY

SURFICIAL GEOLOGY OF THE HIGHTSTOWN QUADRANGLEMIDDLESEX AND MERCER COUNTIES, NEW JERSEY

OPEN-FILE MAP OFM 44

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Coastal Plain Formations

200

100

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200

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VERTICAL EXAGGERATION 20X

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