- Usage in publication:
-
- Chestnut Hill Formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Arkose
- Quartzite
- Conglomerate
- Rhyolite
- AAPG geologic province:
-
- Appalachian basin
Summary:
The Chestnut Hill Formation, here named, is a poorly exposed sequence of arkose, ferruginous quartzite, quartzite, conglomerate, metarhyolite, and metasaprolite along the north border of the Reading Prong on Chestnut Hill, PA, and Marble Mountain, NJ. Was included in the Pickering Gneiss of Bayley (1914), and in the Moravian Heights Formation of Fraser (1939). Overlies other metasedimentary and metavolcanic rocks of the Reading Prong and differs from them in that bedding can be recognized and it is at lower metamorphic rank. Age is probably Late Proterozoic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).