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Ammonites and inoceramid bivalves from close to the middle-upper Albian Boundary around Fort Worth, Texas

Published online by Cambridge University Press:  20 May 2016

W. J. Kennedy ,
A. S. Gale ,
J. M. Hancock ,
J. S. Crampton  and
W. A. Cobban
W. J. Kennedy
Affiliation:
Geological Collections, Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, United Kingdom
A. S. Gale
Affiliation:
School of Earth Sciences, University of Greenwich, Medway Towns Campus, Pembroke, Chatham Maritime ME4 4AW, United Kingdom
J. M. Hancock
Affiliation:
Imperial College of Science, Technology and Medicine, Royal School of Mines, Prince Consort Road, London SW7 2BP, United Kingdom
J. S. Crampton
Affiliation:
Institute of Geological and Nuclear Sciences Ltd., Box 30 368, Lower Hutt, New Zealand
W. A. Cobban
Affiliation:
70 Estes Street, Lakewood, Colorado 80226
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Abstract

The Goodland/Comanche Peak Limestone, Kiamichi Formation and basal Duck Creek Limestones around Fort Worth Texas yield a limited number of cosmopolitan ammonite and inoceramid bivalve taxa that allow precise correlation with the sequence that has been used as a standard in northwest Europe. The upper part of the Goodland/Comanche Peak Limestones yields species of Dipoloceras that show the base of the Upper Albian substage, provisionally defined as the first appearance of D. cristatum (Brongniart, 1822), to lie within this unit. Brancoceras aff. cricki Spath, 1934, Mortoniceras (Deiradoceras) beloventer new species, and Actinoceramus cf. concentricus (Parkinson, 1819) parabolicus Crampton, 1996a, co-occurs with D. cristatum in the Comanche Peak Limestone. The Kiamichi Formation yields rare Mortoniceras (Mortoniceras) pricei (Spath, 1922), M. (Deiradoceras) prerostratum Spath, 1921, M. (D.) bipunctatum Spath, 1933, and Actinoceramus sulcatus (Parkinson, 1819) morphotypes that allow correlation with the European Hysteroceras orbignyi and Hysteroceras varicosum subzones of the Mortoniceras inflatum zone. The basal Duck Creek Limestone yields Mortoniceras (Deiradoceras) sp. and Hysteroceras cf. varicosum (J. de C. Sowerby, 1824), and can also be correlated with the varicosum subzone.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 6 , November 1999 , pp. 1101 - 1125
Copyright
Copyright © The Paleontological Society 

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