Pliocene ostracoda biofacies in the Isthmian Saline basin, Veracruz, Mexico
Study, including cluster analysis, of 90 species of marine Pliocene Ostracoda of the Isthmian Saline Basin, reveals four distinct biofacies that correspond from oldest to youngest to the Encanto, Lower and Upper Concepcion, and Agueguexquite strata. Each biofacies presents a characteristic fauna that represents a different environment of deposition and slightly different age. The Encanto biofacies is indicative of middle to upper bathyal environments and contains Ambocythere spp., Argilloecia posterotruncata Bold, Bradleya normani, Krithe trinidadensis Bold, and Parakithe spp. The Lower Concepcion assemblage (N20) represents an upper bathyal to outer neritic environment by the presence of Actinocythereis vineyardensis, Echinocythereis spp, Henryhowellaex gr. asperrima Hulingsina sp 1, and the last appearance of the Encanto species. The Upper Concepcion assemblage is similar to the Lower Concepcion one, except that it lacks the bathyal Encanto species, and possesses shallow-water species such as Cytherura wardensis Howe and Brown, Loxoconcha tricornata, Loxoconcha sp A, and abundant reworked brackish-water species representing an outer neritic environment. The Agueguexquite biofaices contains the shallowest fauna with species such as Cytherura spp, Malzella conradi, Puriana gatunensis, Cytherella vermillionensis Kontrovitz, Loxoconcha wilberti Puri, Bairdia aff. longisetosa Brady, and Bairdoppilata sp. Overall the Ostracoda fauna indicates a shallowing upwards trend reflecting a rapid filling of the basin.
- Research Organization:
- Louisiana State Univ., Baton Rouge (USA)
- OSTI ID:
- 6462830
- Report Number(s):
- CONF-8510489-
- Journal Information:
- Geol. Soc. Am., Abstr. Programs; (United States), Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Vol. 17; ISSN GAAPB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580100* -- Geology & Hydrology-- (-1989)
ANIMALS
AQUATIC ORGANISMS
CENOZOIC ERA
DEVELOPING COUNTRIES
ECOLOGY
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GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOLOGY
INVERTEBRATES
LATIN AMERICA
MEXICO
MOLLUSCS
NORTH AMERICA
PALEONTOLOGY
PLIOCENE EPOCH
SEDIMENTARY BASINS
STRATIGRAPHY
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