The Permian biostratigraphy of the Kolyma–Omolon region, Northeast Asia

High‐resolution Lopingian (Late Permian) timescale of South China

“…The Lopingian Series in the Verkhoyansk Folded Belt, the Kolyma-Omolon Block is represented by the Khivachian Horizon. Only brachiopod and bivalve assemblages are established in this region (Ganelin and Biakov, 2006;Klets et al, 2006). Conodonts have not been reported; therefore it is difficult to correlate in detail with the Lopingian of South China.…”

The marine Permian of East and Northeast Asia: an overview of biostratigraphy, palaeobiogeography and palaeogeographical implications

“…The Permian stratigraphy and biostratigraphy of this terrane have been summarized and reviewed comprehensively by Ustritskiy (1971), Ganelin (in Kotlyar and Stepanov, 1984), Kashik et al (1990), Ganelin (1997), Biakov (2000Biakov ( , 2004, Ganelin et al (2003), and Ganelin and Biakov (2006). Of these works, the recent paper by Ganelin et al (2003) was probably most significant in that it has erected a composite biostratigraphical framework for the Permian of the Kolyma-Omolon region, with a view to extending it to the whole NE Asian territory as a regional standard.…”

“…of the Kolyma-Omolon Terrane, and are dominated by sandstone and volcaniclastic rocks. Marine faunas are not diverse, but distinctive in that the brachiopod genus Verchojania made its last appearance, while Jakutoproductus appeared for the first time (Ganelin and Biakov, 2006). This implies that the phylogenetic transition of the two related genera in the family Plicatiferidae had been completed during this time, most likely at the boundary between the two horizons.…”

“…Within both zones there are abundant brachiopods, many of which also occur in the Russian Platform and the Urals, for example: Sowerbina, Waagenoconcha, and Spiriferella. The two zones, however, are clearly separable, because the Anidanthus aagardi Zone completely lacks Jakutoproductus on the one hand and, on the other, contains first appearance of Inoceramus-like bivalves, notably represented by the genus Aphanaia, which locally form conquina beds in hydrogene sulphate limestones (Ganelin, 1997;Ganelin and Biakov, 2006). Ammonoids also became relatively more common, compared with the underlying horizons, with Paragastrioceras josse occurring in the Koargychanian Horizon and Epijuresanites, Neouddenites, Tumaroceras, and Uraloceras in the Khalalinian Horizon.…”

Permian bivalve mollusks of Northeast Asia

“…The bivalve-based biozones and their correlation with brachiopod faunas, as well as with the East European and International Permian timescales, are summarized in Ganelin and Biakov (2006).…”