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- Title
Calpionellid biostratigraphy, U-Pb geochronology and microfacies of the Upper Jurassic-Lower Cretaceous Pimienta Formation (Tamazunchale, San Luis Potosí, central-eastern Mexico).
- Authors
López-Martínez, Rafael; Barragán, Ricardo; Reháková, Daniela; Martini, Michelangelo; de Antuñano, Samuel Eguiluz
- Abstract
Detailed sampling of a stratigraphic section corresponding to the La Pimienta Formation in the state of San Luis Potosí allows the determination of the upper Tithonian Crassicollaria Zone (Remanei, Brevis and Colomi Subzones). The presence of Praetintinnopsella andrusovi Borza and chitinoidellids in the Crassicollaria Zone, was interpreted as the result of sedimentary reworking as due to fact that these taxa have not been reported in such a high stratigraphic position. Nonetheless additional work is needed in order to establish a clear relationship. The U-Pb date for a bentonite bed that underlies rocks of the Elliptica Subzone is 139.1 ± 2.6 Ma (late Berriasian-early Valanginian). These new data suggest a different age range for the Elliptica Subzone in Mexico as compared with coeval sections in the Mediterranean Tethys.
- Subjects
BIOSTRATIGRAPHY; GEOLOGICAL time scales; FACIES; CRETACEOUS paleoecology; SEDIMENTATION &; deposition
- Publication
Boletín de la Sociedad Geológica Mexicana, 2015, Vol 67, Issue 1, p75
- ISSN
1405-3322
- Publication type
Article