Remarkable preservation of shell microstructures from the Late Ordovician of the Cincinnati Arch region, USA, and the success of nacre among Ordovician mollusks

Michael J. Vendrasco; Antonio G. Checa; William P. Heimbrock

doi:10.1017/jpa.2018.106

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Michael J. Vendrasco,^1,2 Antonio G. Checa,² William P. Heimbrock³

¹Department of Geology, Pasadena City College, 1570 East Colorado Blvd., E-215, Pasadena, California, 91106, USA <mvendrasco@pasadena.edu>
²Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada 18071, España <acheca@ugr.es>
³Dry Dredgers, 1621 Westwood Avenue, Cincinnati, Ohio, 45214, USA <billheim@cinci.rr.com>

Abstract

Exceptional sub-micrometer details of shell microstructure are preserved in phosphatic micro-steinkerns representing several phyla from shell beds of the Upper Ordovician of the Cincinnati Arch region, USA. These fossils provide the most detailed record of Ordovician mollusk shell microstructures, as well as exceptional details on the earliest cases of undisputed nacre. The trend towards nacre in the Mollusca is one aspect of the surge in escalation between mollusks and their predators during the Great Ordovician Biodiversification Event.

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Michael J. Vendrasco, Antonio G. Checa, and William P. Heimbrock "Remarkable preservation of shell microstructures from the Late Ordovician of the Cincinnati Arch region, USA, and the success of nacre among Ordovician mollusks," Journal of Paleontology 93(4), 658-672, (2 July 2019). https://doi.org/10.1017/jpa.2018.106

Accepted: 17 December 2018; Published: 2 July 2019

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