The Conestoga Formation is a geologic formation in Pennsylvania.

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.
Typesedimentary, metamorphic
OverliesVintage Dolomite
Lithology
Primarylimestone
Otherphyllite, conglomerate
Location
Region Pennsylvania
Country United States
Type section
Named byKnopf and Jonas (1923)
Folded micaceous marble of Conestoga Formation, in a quarry a half-mile northwest of Quarryville
Basal Conestoga (slate and limestone conglomerate), unconformably overlying Vintage Dolomite, Bellemont Quarry

Description

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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.[1]

Type section

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Named from outcrops along Conestoga River, Lancaster County, Pennsylvania.

References

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  1. ^ Conestoga Formation, USGS Mineral Resources On-Line Spatial Data