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Linguliform brachiopods across a Cambrian–Ordovician (Furongian, Early Ordovician) biomere boundary: the Sunwaptan–Skullrockian North American Stage boundary in the Wilberns and Tanyard formations of central Texas

Published online by Cambridge University Press:  30 May 2018

Rebecca L. Freeman Open the ORCID record for Rebecca L. Freeman [Opens in a new window] ,
James F. Miller  and
Benjamin F. Dattilo
Rebecca L. Freeman
Affiliation:
Department of Earth & Environmental Science, University of Kentucky, Lexington, KY 40506, 〈rebecca.freeman@uky.edu〉
James F. Miller
Affiliation:
Geography, Geology, & Planning, Missouri State University, Springfield, MO 65897, 〈jimmiller@missouristate.edu〉
Benjamin F. Dattilo
Affiliation:
Department of Biology, Indiana University Purdue University Fort Wayne, Fort Wayne, IN 46805-1499, 〈dattilob@ipfw.edu〉
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Abstract

The Cambrian-Ordovician Diversity Plateau, between the Cambrian Explosion and the Ordovician Radiation, is punctuated by a series of well-documented Laurentian trilobite extinction events. These events define the bounding surfaces of trilobite ‘biomeres’ that correspond to North American stages, including those of the Sunwaptan and Skullrockian. Trilobites show a consistent pattern of recovery across these boundaries, and commonly each extinction and replacement of taxa is interpreted as a single event as changing environmental conditions spurred shoreward migration of shelf or oceanic faunas that displaced established cratonic faunas. Linguliform brachiopods are also abundant in strata of this interval, and we investigate their stratigraphic distribution across the Sunwaptan–Skullrockian Stage boundary in Texas through high-resolution stratigraphic sampling of subtidal sediments. We document complete genus- and species-level turnover of the linguliform brachiopod fauna coincident with trilobite extinction events, suggesting that these brachiopods were affected by the same factors that affected trilobites. The Skullrockian replacement fauna was cosmopolitan, with ties to Gondwana and Kazakhstan and to the Laurentian shelf environment. The timing of appearances of taxa suggests that the faunal migration onto the Laurentian shelf came from elsewhere during a transgression. The disappearance of the Sunwaptan fauna and the arrival of the Skullrockian fauna are distinct events. We suggest that ‘biomere’ events may be complex, and the cause of the extinction is not necessarily the same event that facilitates the appearance of a replacement fauna. We describe one new species, Schizambon langei.

UUID: http://zoobank.org/f6a5c11f-cd3d-4c16-b184-d808d3a5285f

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Journal of Paleontology , Volume 92 , Issue 5 , September 2018 , pp. 751 - 767
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Copyright © 2018, The Paleontological Society 

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