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| Conestoga Formation | |
|---|---|
| Stratigraphic range: Middle Cambrian to Early Ordovician | |
 Thick-bedded crystalline limestone passing into finely laminated slaty limestone typical of the Conestoga, in quarry 1 mile northwest of Bellemont. | |
| Type | sedimentary, metamorphic |
| Overlies | Vintage Dolomite |
| Lithology | |
| Primary | limestone |
| Other | phyllite, conglomerate |
| Location | |
| Region |  Pennsylvania |
| Country |  United States |
| Type section | |
| Named by | Knopf and Jonas (1923) |
The Conestoga Formation is a geologic formation in Pennsylvania.
Description
Light-gray, thin-bedded, impure, contorted limestone having shale partings; conglomeratic at base; in Chester Valley, includes micaceous limestone in upper part, phyllite in middle, and alternating dolomite and limestone in lower part.
Type section
Named from outcrops along Conestoga River, Lancaster County, Pennsylvania.
References
- Conestoga Formation, USGS Mineral Resources On-Line Spatial Data