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Lower Ordovician (Tremadocian) lingulate brachiopods from the House and Fillmore formations, Ibex area, western Utah, USA

Published online by Cambridge University Press:  20 May 2016

Lars E. Holmer
Affiliation:
Institute of Earth Sciences, Paleobiology, Uppsala University, SE-752 36 Uppsala, Sweden, ,
Leonid E. Popov
Affiliation:
Department of Geology, National Museum of Wales, Cathays Park, Cardiff CF10 3NP, Wales, United Kingdom,
Michael Streng
Affiliation:
Institute of Earth Sciences, Paleobiology, Uppsala University, SE-752 36 Uppsala, Sweden, ,
James F. Miller
Affiliation:
Geography, Geology, & Planning Department, Missouri State University, Springfield 65804, USA,

Abstract

Seven genera and eight species of lingulate brachiopods were recovered from the House Limestone and lower Fillmore Formation, Ibex area, Utah, USA. These strata are assigned to the upper Skullrockian Stage and lower Stairsian Stage of the Ibexian Series (Iapetognathus Conodont Zone to Low Diversity Interval) and are correlated with the Tremadocian Series of the Acado–Baltic Faunal Province. The fauna includes two new linguloid species, Spinilingula prisca and Wahwahlingula sevierensis, one new siphonotretoid species, Schizambon obtusus, and two new acrotretoid species, Eurytreta fillmorensis and Ottenbyella ibexiana. The last species is the first record of the genus in North America and suggests a correlation of the basal Fillmore Formation with the Ceratopyge Limestone in Sweden. A Siphonobolus? covered by long hollow spines may be one of the oldest siphonotretides with such ornament. This fauna and those described previously from older Utah strata document the biodiversification of the Cambrian–Ordovician lingulate brachiopods and demonstrate their potential for regional and intercontinental correlation.

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Type
Research Article
Copyright
Copyright © The Paleontological Society 

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