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Geological Society, London, Special Publications; 2007; v. 275; p. 189-200;
DOI: 10.1144/GSL.SP.2007.275.01.12
© 2007 Geological Society of London

The late Atokan (Moscovian, Pennsylvanian) chaetetid accumulations of Sierra Agua Verde, Sonora (NW Mexico): composition, facies and palaeoenvironmental signals

Emilio Almazán-Vázquezi1, Blanca E. Buitrón-Sánchez, Daniel Vachard3, Cynthia Mendoza-Madera1 & Catalina Gómez-Espinosa

1 Universidad de Sonora, Departamento de Geología, Boulevard Luis Encinas y Rosales, 83000 Hermosillo, Sonora, Mexico(e-mail: almazan{at}geologia.uson.mx)
2 Universidad Nacional Autónoma de México, Instituto de Geología, Departamento de Geología, Ciudad Universitaria, Delegación Coyoacán, 04510 México, D.F., Mexico
3 Université de Lille 1, Sciences de la Terre, UMR 8014 du CNRS, Laboratoire LP3, Bâtiment SN5, 59655 Villeneuve d'Ascq Cedex, France(e-mail: daniel.vachard{at}univ-lille1.fr)

The La Joya Formation of the Sierra Agua Verde, Sonora (NW Mexico) is late Atokan in age, equivalent to the early late Moscovian (Podolskian) and fusulinid biozone A3. In this alternance of cherty limestones and thin shaly beds, fusulinellid or anchicodiacean (‘phylloid algae’) wackestones-packstones and crinoidal rudstones-grainstones are the predominant microfacies, but chaetetid boundstones are conspicuous. These chaetetid occurrences of the Sierra Agua Verde are compared with the accumulations of Arizona, Texas, Kansas and Nevada (USA), and the Cantabric Cordillera (Spain). In Sonora, the environments with chaetetids were quiet, and located below wave base. Shallower facies with staffellids and Komia generally top the chaetetids. Because of the associated micritic deposits, the chaetetids have inhabited probably a soft or firm substrate. As a result of the disphotic-aphotic reconstructed environments, the possible symbionts of the chaetetids are more probably heterotrophic bacteria than autotrophic algae. The most comparable ecological conditions exist in the Atokan Marble Falls Formation of central Texas (USA). Chaetetids are not mentioned in the southern suspect terranes of Mexico, but were possibly present because these regions were located along the probable migration way to Peru, the southernmost area where Pennsylvanian chaetetids are known.





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B. E. Buitron-Sanchez, C. Gomez-Espinosa, E. Almazan-Vazquez, and D. Vachard
A late Atokan regional encrinite (early late Moscovian, Middle Pennsylvanian) in the Sierra Agua Verde, Sonora state, NW Mexico
Geological Society, London, Special Publications, 2007; 275: 201 - 209.
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