Middle Ordovician (Whiterockian) gastropods from central Sonora, Mexico: affinities with Laurentia and the Precordillera

Francisco Javier Cuen-Romero*, David M. Rohr, Héctor Arturo Noriega-Ruiz, Rogelio Monreal, Robert B. Blodgett, Matilde S. Beresi, Blanca E. Buitrón-Sánchez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The Lower-Middle Ordovician (Ibexian, Whiterockian) sedimentary rocks exposed at Rancho Las Norias includes the informally named Las Norias formation, which consists of an intercalation of carbonate and clastic sediments with abundant marine fauna. These deposits occur as the most austral sedimentary rocks of Ordovician age for Laurentia, providing a critical link to understand the distribution of Ordovician marine faunas of North America. An investigation of the gastropod fauna from the upper portion of the Las Norias formation, Sonora, Mexico, is undertaken for the first time. The gastropod assemblage includes Maclurites acuminatus, ?Monitorella sp., Lecanospira sp., Malayaspira aff. M. rugosa, Lophospira perangulata, and Hormotoma? sp. This assemblage indicates a paleogeographic relationship with Laurentia, including the USA (Nevada), Canada (British Columbia, Newfoundland), Greenland, and the Argentine Precordillera.

Original languageEnglish
Pages (from-to)1037-1046
Number of pages10
JournalJournal of Paleontology
Issue number5
StatePublished - 19 Sep 2022

Bibliographical note

Funding Information:
The authors thank the Departamento de Geología, Universidad de Sonora for financial support to carry out this research. We are indebted to M.A. Flores-Castro for the support provided during fieldwork. We are grateful to J.O.R. Ebbestad (Uppsala University, Sweden) and an anonymous reviewer for kindly reviewing this manuscript. We are also thankful for the support provided by the editorial and production team of JP, including J. Kastigar and J. Musha.

Publisher Copyright:
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Paleontological Society.


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