Hammer Creek Formation
The Hammer Creek Formation is a mapped bedrock unit consisting primarily of conglomerate, coarse sandstone, and shale.
| Hammer Creek Formation | |
|---|---|
| Stratigraphic range: Late Triassic | |
| Type | Sedimentary |
| Unit of | Newark Supergroup |
| Overlies | New Oxford Formation |
| Thickness | 9400 to 12200 feet |
| Lithology | |
| Primary | Sandstone, conglomerate |
| Other | Shale |
| Location | |
| Extent | Pennsylvania |
| Type section | |
| Named for | Hammer Creek |
| Named by | J. D. Glaeser, 1963 |
The Hammer Creek Formation was originally mapped as part of the Gettysburg Formation in Adams County, Pennsylvania in 1929. J. D. Glaeser renamed part of the Gettysburg to the Hammer Creek in 1963, to "avoid extending either the Gettysburg Formation from the west or the Brunswick Formation from the east to include rocks typical of neither unit."
A major groundwater resources study of the Hammer Creek Formation and other formations of the Newark Supergroup in Pennsylvania was published by Charles R. Wood in 1980.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.