Journal
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Volume 62, Issue -, Pages 92-108Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsames.2015.05.006
Keywords
Late Jurassic; Minas Viejas Formation; Mexico; Ammonites; Bivalves; Gastropods
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Funding
- Deutsche Forschungsgemeinschaft [DFG STI128-17]
- Heidelberg University Graduate Academy [LGFG 2012-9]
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We present the first systematic description of Late Jurassic (late Oxfordian-early Kimmeridgian) invertebrates from the shallow marine Minas Viejas Formation of northeastern Mexico. The unit was generally considered to be extremely poor in fossils, due to an overall evaporitic character. The collection described here includes three taxa of ammonites, 10 taxa of bivalves and five taxa of gastropods. The fossils were discovered near Galeana and other localities in southern Nuevo Leon and northeastern San Luis Potosi, in thin-bedded marly limestones intercalated between gypsum units. Due to complex internal deformation of the sediments, fossils used for this study cannot be assigned to precise layers of origin. However, the taxa identified suggest a Late Jurassic (late Oxfordian-early Kimmeridgian) age for these fossil-bearing layers and allow us, for the first time, to assign a biostratigraphic age to Upper Jurassic strata in the region underlying the La Caja and La Casita formations. (c) 2015 Elsevier Ltd. All rights reserved.
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