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

Published online by Cambridge University Press:  04 May 2022

Francisco Javier Cuen-Romero Open the ORCID record for Francisco Javier Cuen-Romero [Opens in a new window] ,
David M. Rohr Open the ORCID record for David M. Rohr [Opens in a new window] ,
Héctor Arturo Noriega-Ruiz ,
Rogelio Monreal ,
Robert B. Blodgett ,
Matilde S. Beresi  and
Blanca E. Buitrón-Sánchez
Francisco Javier Cuen-Romero*
Affiliation:
Departamento de Geología, Universidad de Sonora, Blvd. Luis Encinas y Rosales, CP. 83000, Hermosillo, Sonora, México. ,
David M. Rohr
Affiliation:
Department of Biology, Geology and Physical Sciences, Sul Ross State University, Alpine, Texas 79832, USA.
Héctor Arturo Noriega-Ruiz
Affiliation:
Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Luis Donaldo Colosio s/n, entre Sahuaripa y Reforma, Col Centro, CP. 83000, Hermosillo, Sonora, México.
Rogelio Monreal
Affiliation:
Departamento de Geología, Universidad de Sonora, Blvd. Luis Encinas y Rosales, CP. 83000, Hermosillo, Sonora, México. ,
Robert B. Blodgett
Affiliation:
Consulting Geologist, 2821 Kingfisher Drive, Anchorage, AK 99502, USA.
Matilde S. Beresi
Affiliation:
Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. A. Ruiz Leal s/n, Parque General San Martín, 5500, Mendoza, Argentina.
Blanca E. Buitrón-Sánchez
Affiliation:
Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, CDMX, 04510, México.
*
*Corresponding author.
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Abstract

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.

Type
Articles
Information
Journal of Paleontology , Volume 96 , Issue 5 , September 2022 , pp. 1037 - 1046
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Paleontological Society

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