BIOSTRATIGRAPHY AND BIOFACIES OF THE PLATAFORMA DELTANA AREA, EASTERN VENEZUELA
The assemblages reveal marked differences in taxonomic composition and diversity, reflecting inner neritic to middle bathyal conditions. Three foraminiferal biofacies (FB) are distinguished: FB1 (Erin Formation, Pleistocene). Consists of interbedded sand and clay. The foraminiferal assemblages are: Bulimina marginata d´Orbigny, Brizalina isidroensis, Nonion sp, Uvigerina peregrina, Globocasidulina subglobosa, Elphidium incertum, Quinqueloculina sp and Miliolidae. Paleoenvironments of depositation ranged from inner to middle neritic. FB2 (Palmiste Formation, Late Pliocene). Consists of sands interbedded silts and clay. The dominant species are: Nonionella atlantica, Nonion sp, Miliolidae and Neoeponides sp. Paleoenvironment of depositation is inner neritic. FB3 ( Gros Morne Formation, Early Pliocene). Consists of well bedded gray silts and sands. The foraminiferal assemblages are entirely agglutinated: Glomospira charoides, Glomospira gordialis, Alveovalvulina suteri, Recurvoides sp, Hormosina sp and Saccammina sp . Paleoenvironments of depositation ranged from upper to middle bathyal.