Middle Devonian Chitinozoa of Indiana
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Date
1980
Authors
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Publisher
Indiana Geological Survey
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Abstract
Middle Devonian chitinozoans from the
Muscatatuck Group of Indiana belong to eight
species of the genera Alpenachitina, Ancyrochitina,
Angochitina, Eisenackitina, and
Hoegisphaera. The Chitinozoa are most
abundant in the carbonate rocks that
represent well-circulated open-water conditions
and are low in diversity or are absent
from lithographic and laminated dolomite
representing the shallower, more restricted
environments. The local range zones of the
chitinozoans from the Muscatatuck Group,
when compared with the occurrence of similar taxa from correlative strata in the
midwestern United States, are quite parallel to the established conodont zones. The lowest occurrence of Alpenachitina eisenacki, Angochitina callawayensis, and Eisenackitina inflate in the lowermost rocks of the Muscatatuck Group is in the Icriodus latericrescens robustus Zone, which is early Eifelian in age. Ancyrochitina hamiltonensis in association with A. cf. A. spinosa and Hoegisphaera glabra characterizes the upper part of the Muscatatuck rocks, and the occurrence of
those chitinozoans ranges from the upper part of the late Eifelian I. angustus Zone into the early Givetian I. latericrescens latericrescens Zone.
Description
Keywords
Chitinozoa, Indiana, Middle Devonian, Limestone
Citation
Wright, Robert P., 1980, Middle Devonian Chitinozoa of Indiana. Indiana Geological Survey Special Report 18, 24 p., 2 fig., 5 pl., 1 tbl.
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Type
Technical Report