Introduce of three species of Echinoid Douvillaster and a species of bivalve Neithea from the Dariyan Formation, in the Mish Anticline, NE Gachsaran
Subject Areas :
Keywords: Aptian Douvillaster Neithea Dariyan Formation Zagros Southwest Iran,
Abstract :
Three species of Spatangoid Echinoid belonging to genus Douvillaster: D. douvillei Gauthier, 1902; D. longesulcatus Cotteau and Gauthier, 1895; D. valamtarensis Gauthier, 1902, and a species of Neitheidae Bivalve belonging to subgenus Neithea (Neithea): Neithea (Neithea) coquandi Peron, 1877, were described from the Aptian deposits (Dariyan Formation) at the Mish anticline in the Zagros basin, southwest of Iran. Douvillaster was recorded from the Aptian to the Turonian of the Tethyan margins (Middle East, Africa, Madagascar and Europe). The first appearance of Neithea in the North Pacific is in the Berriasian, and was continuously present until the late Albian and reached their maximum diversity in the late Aptian (this coincides with the Late Aptian global warming phase). The Neithea appeared in the Berriasian in the Tethyan realm (like to North Pacific region), thrived in the Mid-Cretaceous (Cenomanian), then decreased in diversity and finally became extinct at the end of Cretaceous.