- Usage in publication:
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- Ashokan beds
- Modifications:
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- Original reference
- Dominant lithology:
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- Shale
- Sandstone
- AAPG geologic province:
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- Appalachian basin (Eastern Overthrust area)
Summary:
Pg. 954. Ashokan beds. Nonmarine terminal phase of Hamilton in Ulster County region, eastern New York. Shales and sands 500 to 600 feet thick. No fossils except plants. Form principal bluestone formation of Ulster County. Prosser erroneously called these beds Sherburne in his monograph on Hamilton and Portage beds of eastern New York. Overlie Mount Marion beds, the lower fossiliferous Hamilton beds of Ulster County region. [Age is Middle Devonian.]
Source: US geologic names lexicon (USGS Bull. 896, p. 82).
- Usage in publication:
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- Ashokan formation
- Modifications:
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- Principal reference
- Revised
- AAPG geologic province:
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- Appalachian basin (Eastern Overthrust area)
Summary:
Pg. 468-470. Ashokan formation. The so-called Sherburne sandstone of the Helderbergs. Shales and flags 500+/- feet thick. Underlies Oneonta formation in Ulster and Greene Counties, eastern New York. No fossils. I am satisfied this formation is a continental phase of Upper Hamilton and therefore beneath base of typical Sherburne sandstone. Rests on Marion beds without stratigraphic break. [Age is Middle Devonian.]
Named from exposures in Ashokan district, west of Kingston, [Ulster Co.], eastern NY.
Source: US geologic names lexicon (USGS Bull. 896, p. 82).
- Usage in publication:
-
- Ashokan beds
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Appalachian basin (Eastern Overthrust area)
Summary:
G.H. Chadwick (1932) has named the beds overlying Ashokan bluestone in Catskill area the Kiskatom red beds.
Source: US geologic names lexicon (USGS Bull. 896, p. 82).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).