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Geologic Unit: Lachine
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  • Usage in publication:
    • Lachine Member*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Michigan basin
Publication:

Gutschick, R.C., and Sandberg, C.A., 1991, Upper Devonian biostratigraphy of the Michigan basin, IN Catacosinos, P.A., and Daniels, P.A., Jr., eds., Early sedimentary evolution of the Michigan basin: Geological Society of America Special Paper, 256, p. 155-179.


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 Lachine Member is here named for the town of Lachine. Consists of radioactive black shale with thin layers of greenish-gray shale and concretions. Conformably overlies the Paxton Member; conformably underlies the informal upper member of the Antrim. Thickness at type section is 19.2 m. Age is Late Devonian (early Famennian) 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 ([ ]).

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