Chestnut Hill Formation

(Drake, 1984) - Interbedded arkose, ferruginous quartzite, quartzite conglomerate, metarhyolite, and metasaprolite. Confined to a few small areas north and east of Phillipsburg, on the western side of Bowling Green Mountain, northwest of High Bridge, and a few areas too small to show at this map scale.
State New Jersey
Name Chestnut Hill Formation
Geologic age Late Proterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartziteferruginous quartzite, quartzite conglomerate
Sedimentary > Clastic > Sandstone > Arkose (Bed)
Sedimentary > Clastic > Conglomerate (Bed)quartzite conglomerate
Minor
Metamorphic > Metaigneous > Metavolcanic > Metarhyolite
Comments Note that there is a unit Zd (Diabase dikes) that is described in the digital description and is used on the printed map; but it is not used on the digital map. Probably because it is a line feature and the digital geology is only polygons. Unit Zd has NOT been entered here.
References

Dalton, R.F., Herman, G.C., Monteverde, D.H., Pristas, R.S., Sugarman, P.J., and Volkert, R.A., 1999, New Jersey Department of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1), scale 1:100,000.

Drake, Avery A. Jr.,Volkert, Richard, A., Monteverde, Donald H., Herman, Gregory C., Houghton,Hugh F., Parker, Ronald A., and Dalton, Richard F., 1996, Bedrock Geologic Map of Northern New Jersey: U.S. Geological Survey Miscellanenous Investigations Map I-2540-A, 4 cross sections, 2 sheets, size 56x40; 58x41, scale 1:100.000.

https://pubs.er.usgs.gov/publication/i2540A

Drake, A.A., Jr., 1984, The Reading Prong of New Jersey and eastern Pennsylvania; an appraisal of the rock relations and chemistry of a major Proterozoic terrane in the Appalachians, in Bartholomew, M.J., ed., The Grenville event in the Appalachians and related topics: Geological Society of America Special Paper 194, p. 75-109.

NGMDB product
Counties Hunterdon - Warren