Machain-Castillo, M. L. (1986). Ostracode biostratigraphy and paleoecology of the Pliocene of the Isthmian Salt Basin, Veracruz, Mexico. Tulane Studies in Geology and Paleontology. 19 (3): 123-139.

212000

Machain-Castillo, M L

1986

19 (3): 123-139

Publication

A detailed systematic and cluster analy?sis study of samples from the Pliocene of the Isthmian Salt Basin, Veracruz, Mexico, shows characteristic ostracode as?semblages for the Encanto, Lower and Upper Concepcion, and Agueguexquite strata, and a shall owing-upward trend during the Pliocene. The Encanto strata, the oldest unit (NI9 or upper NI8), are characterized by Am?bocythere spp., Argilloecia posterotrun?cata, Bradleya normani, Krithe trinidaden?sis and Parakrithe spp., indicating a mid?dle to upper bathyal environment. The Lower and Upper Concepcion beds (NI9-20) can be recognized by the presence of Actinocythereis vineyardensis, Touro?concha lapidiscola, and the abundance of Hulingsina sp. 1, Henryhowella ex. gr. as?perrima, and Puriana spp. Encanto species persisting in the Lower Concep?cion beds indicate an upper bathyal to outer neritic environment. The Upper Concepcion beds lack these species but in?stead possess abundant Cyprideis and Perissocytheridea spp., Basslerites? sp., Malzella conradi and Echinocythereis margaritifera. The Upper Concepcion as?semblage indicates an outer to middle shelf environment. The Filisola and Paraje Solo samples were barren of ostracodes. Their foraminiferal and mollusk fauna indicates nearshore and brackish environments. The Paraje Solo may be in part contem?poraneous to the Agueguexquite. The Agueguexquite strata contain the youngest (middle N20), most abundant, and diverse fauna, indicating an inner neritic environ?ment of deposition and representing a local marine transgression of short duration in the northern part of the basin. By upper Agueguexquite time brackish and conti?nental conditions returned.

Ostracoda

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