Maastrichtian ammonites and biostratigraphy of the Sakhalin and the Shikotan Islands, Far Eastern Russia

Abstract

Stratigraphy, ammonite paleontology, and regional characteristics are presented from the Maastrichtian deposits of the Sakhalin and the Shikotan Islands, Far Eastern Russia. Two different ammonite biostratigraphic zonal schemes based on the representatives of the family Desmocerataceae and the Tetragonitaceae, respectively, are established and their correlation with the Japanese ammonite zonation is suggested. All ammonites are monographed, and of the recognized 17 species, part is reported for the first time from the Maastrichtian of the studied area, the Kamchatka Peninsula including.