- Usage in publication:
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- Paxton Member*
- Modifications:
-
- Named
- Biostratigraphic dating
- Dominant lithology:
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- Limestone
- Shale
- AAPG geologic province:
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- Michigan basin
Summary:
Age of the Antrim Shale in the Michigan Basin is changed to Late Devonian only based on conodonts, and is divided into four members, from base to top: Norwood, Paxton, Lachine, and upper members. The informal "light-colored calcareous unit" of Gutschick (1987) is here named the Paxton Member. Consists of interbedded light-gray, argillaceous limestone and greenish-gray calcareous shale. Conformably overlies the Norwood Member (revised); conformably underlies the Lachine Member (new) of the Antrim. Thickness at type section is 5.9 m. Age is Late Devonian (late Frasnian) based on conodonts.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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 ([ ]).