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Early Devonian conodonts from a limestone horizon in the Caballos Novaculite, Marathon Uplift, west Texas

Published online by Cambridge University Press:  14 July 2015

James E. Barrick  and
Paula J. Noble
James E. Barrick
Affiliation:
Department of Geosciences, Texas Tech University, Lubbock 79413, and
Paula J. Noble
Affiliation:
Geology Department, California State University–Sacramento, Sacramento 95819
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Abstract

Early Devonian (Lochkovian; eurekaensis Zone) conodonts occur in discontinuous limestone beds in the Caballos Novaculite at five localities in the northwestern half of the Marathon uplift, west Texas. Similar conodont faunas at all five localities indicate that the limestone beds lie at one biostratigraphic horizon within the Caballos. The upper novaculite member directly overlies the limestone horizon at one locality, giving the upper novaculite a maximum age of Lochkovian. The limestone beds are dominantly skeletal calcarenites that represent shallow-water carbonate material transported into a deeper water setting by gravity processes. Restriction of the limestones to the northwestern margin of the uplift and provenance of reworked clasts and redeposited Ordovician and Silurian conodonts suggest a North American shelf source and are evidence of the close proximity of some strata exposed in the Marathon uplift to North America in the Early Devonian. Icriodus gravesi n. sp. is described from the limestone fauna.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue 6 , November 1995 , pp. 1112 - 1122
Copyright
Copyright © The Paleontological Society 

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