Conodont zones in the Rockford Limestone and the lower part of the New Providence Shale (Mississippian) in Indiana (1964)

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Authors: Carl Rexroad
Alan Scott

Bactrognathus-Polygnathus communis Assemblage Zone. This zone is absent in southern Indiana and adjacent Kentucky, and here in the conodonts belong in the next zone above, the Bactrognathus-Taphrognathus Assemblage Zone. The lower part of the New Providence in northern Indiana correlates with the lower part of the Burlington Limestone of the Mississippi Valley, a limestone which includes the Fern Glen Formation of some authors; to the south the lower part can be no older than late Burlington in age. The assemblage zones are those recognized by Collinson, Scott, and Rexroad in 1962, but the name of one is herein changed from the Siphonodella n. sp. A-S. cooperi to the Siphonodella isosticha-S. cooperi Assemblage Zone. As an adjunct to stratigraphic interpretation the new species Gnathodus antetexanus is named." style="width:400px; height:120px;">ABSTRACT: Conodonts from 24 localities in Indiana and adjacent Kentucky were studied in order to learn more precisely the age and stratigraphic relationships of the lower Mississippian rocks assigned to the Rockford Limestone and the lower part of the New Providence Shale. The Rockford includes strata of both the Kinderhook and Osage Series. The Kinderhook portion is characterized by conodonts belonging in the Siphonodella isosticha-S. cooperi Assemblage Zone and the Osage by conodonts of the Gnathodus semiglaber-Pseudopolygnathus multistriata Assemblage Zone. Thus the Rockford correlates with the upper part of the Chouteau Limestone and with the "Sedalia" Formation of the Mississippian Valley. The New Providence is Osage in age, but the basal beds in the south are younger than those in the north. In northern Indiana the lower part of the formation contains the fauna of the Bactrognathus-Polygnathus communis Assemblage Zone. This zone is absent in southern Indiana and adjacent Kentucky, and here in the conodonts belong in the next zone above, the Bactrognathus-Taphrognathus Assemblage Zone. The lower part of the New Providence in northern Indiana correlates with the lower part of the Burlington Limestone of the Mississippi Valley, a limestone which includes the Fern Glen Formation of some authors; to the south the lower part can be no older than late Burlington in age. The assemblage zones are those recognized by Collinson, Scott, and Rexroad in 1962, but the name of one is herein changed from the Siphonodella n. sp. A-S. cooperi to the Siphonodella isosticha-S. cooperi Assemblage Zone. As an adjunct to stratigraphic interpretation the new species Gnathodus antetexanus is named.



Rexroad, C. B., Scott, A. J. 1964,  Conodont zones in the Rockford Limestone and the lower part of the New Providence Shale (Mississippian) in Indiana: Indiana Geological Survey Bulletin 30, 54 p., 1 fig., 3 pl.


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Keywords: Rockford Limestone, New Providence Shale, Mississippian, paleontology, conodont, Borden Group, fossil

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