Место издания: Florence , Год издания: 2004

The best marine Permian sections of Siberia occur in the Verkhoyanye. Whole thickness of Permian terrigenous rocks are about 4-6 thousand meters (sandstones, siltstones and argillites). Their biostratigraphy and stratigraphic correlations are based mainly on brachiopod studies, but location of the stage boundaries in the particular sections were defined mainly by ammonoids. Six regional horizons and 19 biozones have been established for the Permian of this area. Khorokytian horizon is Asselian-Early Sacmarian age and includes brachiopod zone Jakutoproductus verchoyanicus-Spirelytha kislakovi and ammonoid zone Bulunites mezhvilki. Echian horizon is Late Sacmarian-Artinskian age and includes 2 brachiopod zones: Jakutoproductus rugosus-Alispiriferella gydanensis and Jakutoproductus burgaliensis-Spirelytha kislakovi and 3 ammonoid zones: Uraloceras simense, Eotumaroceras endybalense, Eotumaroceras subyakutorum. Tumarian horizon is Kungurian-Ufimian age and includes 3 brachiopod zones: Anidanthus aagardi, Megousia kuliki, Kolymaella ogonerensis and 2 ammonoid zones: Tumaroceras yakutorum, Epijuresanites musalitini. Delenzhian horizon is Kazanian age and includes 3 brachiopod zones: Mongolosia russiensis, Terrakea, Tumarinia zavodowskyi and 2 ammonoid zones: Sverdrupites harkeri, Sverdrupites baraiensis. Dulgalakhian horizon is Early Tatarian age and includes brachiopod zone Cancrinelloides obrutschevi. Ammonoidea are not known. Khalpirki horizon is Late Tatarian age and includes brachiopod zone Crassispirifer monumentalis. Ammonoidea are not known.