Mercer Co., New Jersey, USA
|Location is approximate, based on center of defined region.|
|Latitude & Longitude (WGS84):||40° 17' 0'' North , 74° 42' 6'' West|
|Latitude & Longitude (decimal):||40.28343,-74.70175|
NOTE: The geographic coordinates presented are taken from the Princeton topo map. The USGS GNIS database presents 12 sets of coordinates for this county.
Mineral ListMineral list contains entries from the region specified including sub-localities
40 valid minerals.
Rock Types Recorded
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Entries shown in red are rocks recorded for this region.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
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201.3 - 237 Ma
Age: Late Triassic (201.3 - 237 Ma)
Stratigraphic Name: Stockton Formation
Description: Predominantly medium- to coarse-grained, light-gray, light-grayish-brown, or yellowish- to pinkish-gray arkosic sandstone and medium- to fine-grained, violet-gray to reddish-brown arkosic sandstone; with lesser, reddish to purplish-brown, silty mudstone, argillaceous siltstone, and shale. Some coarse-grained sandstone in lower part contains thick beds of conglomerate (Trsc) which have been mapped in the vicinity of Stockton. Sandstone, deposited in high-gradient stream channels, is mostly planar bedded with scoured bases containing pebble lags and mudstone rip-up clasts. Upper part of channel beds are burrowed. Large-scale trough crossbeds occur in some very coarse grained sandstone beds; smaller scale trough and climbing-ripple cross lamination occur in the upper part of channel sequences and in finer grained sandstone beds. Typical floodplain mudstones are irregularly thin bedded and extensively burrowed. Floodplain beds are thicker and more numerous in the central Newark basin, near the Delaware River. Thickness of the unit (including Trsc) near Stockton is about 1,240 m (4,068 ft).
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
Localities in this Region
- New Jersey
- Mercer Co.
- Hopewell Township
- Lawrence Township
- West Windsor Township
- Mercer Co.