The Conestoga Formation is a geologic formation in Pennsylvania.
Conestoga Formation | |
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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 | ![]() |
Country | ![]() |
Type section | |
Named by | Knopf and Jonas (1923) |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Bulletin_799_Plate_5B_Folded_Conestoga_Limestone.jpg/240px-Bulletin_799_Plate_5B_Folded_Conestoga_Limestone.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/Bulletin_799_Plate_4B_Basal_Conestoga_Slate_and_Vintage_Dolomite.jpg/240px-Bulletin_799_Plate_4B_Basal_Conestoga_Slate_and_Vintage_Dolomite.jpg)
Description
editLight-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.[1]
Type section
editNamed from outcrops along Conestoga River, Lancaster County, Pennsylvania.
References
edit- ^ Conestoga Formation, USGS Mineral Resources On-Line Spatial Data