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Ozarkian and Canadian Cephalopods: Part I: Nautilicones

By
E. O. Ulrich
E. O. Ulrich
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Aug. F. Foerste
Aug. F. Foerste
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A. K. Miller
A. K. Miller
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W. M. Furnish
W. M. Furnish
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Published:
January 01, 1942

Coiled nautiloids are not known to occur in the Ozarkian but are widespread in the Upper Canadian of North America. The best preserved and most diversified faunas are from the Lake Champlain region. Also, numerous specimens have been collected at several localities in western Newfoundland and the Mingan Island area. The Southern Appalachian and the Ozark regions have yielded a sequence of faunas which are locally well represented. These few areas constitute all the important occurrences, and only a very small number of questionable specimens are known outside of North America.

All the Canadian nautilicones are rather unspecialized forms with orthochoanitic siphuncles. They vary chiefly in the shape of the conch and the position of the siphuncle. Primarily on the basis of these features, they have been placed in four families: the Deltoceratidae, Plectoceratidae, Tarphyceratidae, and Trocholitidae. Altogether about 75 species are now known, and these are being referred to 17 genera.

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GSA Special Papers

Ozarkian and Canadian Cephalopods: Part I: Nautilicones

E. O. Ulrich
E. O. Ulrich
Search for other works by this author on:
Aug. F. Foerste
Aug. F. Foerste
Search for other works by this author on:
A. K. Miller
A. K. Miller
Search for other works by this author on:
W. M. Furnish
W. M. Furnish
Search for other works by this author on:
Geological Society of America
Volume
37
ISBN print:
9780813720371
Publication date:
January 01, 1942

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