The Conodonts of the Ordovician Maquoketa Formation in Iowa

More than 800 identifiable conodonts were recovered from 124 samples taken from eight outcrops of the Maquoketa formation in northeastern Iowa. A total of 36 species, referable to 14 genera, are described and illustrated. Of these species, Amorphognathus adunca, A. tridigitatus, Belodus dispansus, O...

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Bibliographic Details
Published in:Journal of paleontology 1957-07, Vol.31 (4), p.715-736
Main Author: Glenister, Anne Treloar
Format: Article
Language:English
Subjects:
Arts
Excavations
Fauna
Genera
Keels
Limestones
Mathematical cusps
Shales
Syntypes
Vertebrates
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Summary:More than 800 identifiable conodonts were recovered from 124 samples taken from eight outcrops of the Maquoketa formation in northeastern Iowa. A total of 36 species, referable to 14 genera, are described and illustrated. Of these species, Amorphognathus adunca, A. tridigitatus, Belodus dispansus, Ozarkodina inclinata, and Paltodus feulneri are new. Ambalodus and Amorphognathus were recovered from the basal phosphatic member. Drepandous homocurvatus and Phragmodus undatus are conspicuous faunal elements from near the base of the formation to the top of the medial Ft. Atkinson member. Belodus and a distinctive representative of Oistodus, O. abundans, are present in the lower part, Elgin member, and range to the top of the Ft. Atkinson member. Species of Dichognathus, Phragmodus, and Paltodus were recovered from all five members. A small number of larger forms was recorded from the upper limestone of the Brainard member; Paltodus feulneri and P. intermedius are the most distinctive species of this limestone.
ISSN:0022-3360
1937-2337