Ashokan Formation
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TypeFormation
Unit ofHamilton Group
UnderliesPlattekill Formation, Manorkill Formation
OverliesMount Marion Formation
| Ashokan Formation | |
|---|---|
| Stratigraphic range: Devonian, Givetian | |
| Type | Formation |
| Unit of | Hamilton Group |
| Underlies | Plattekill Formation, Manorkill Formation |
| Overlies | Mount Marion Formation |
| Thickness | Up to 600' |
| Lithology | |
| Primary | Sandstone, Mudstone, Shale |
| Other | Flagstone |
| Location | |
| Region | New York |
| Country | United States |
| Type section | |
| Named for | Named from exposures in Ashokan district, west of Kingston, NY |
| Named by | Grabau A.W., 1917 |
The Ashokan Formation is a geologic formation in eastern New York located in the Catskill Mountains. This formation is Devonian in age. The formation consist cyclical beds of cross bedded dark grey sandstone, olive to brown mudstone and dark grey shale.[1] The Ashokan was formed on the coastal fluvial delta platform to the west of the Taconic Mountains. This formation marks a time of transition from a marine environment to a fluvial/delta environment. This is evident both in the cyclical nature of the formation as well as the biodiversity represented being indictive of a brackish water environment(Goldring, 1935).[2]
