Correlation of the Asselian-Sakmarian deposits of the Northern and Western Verkhoyansk regions by brachiopods

The vertical sequence of the brachiopod association in the key sections of the Lower Permian in the Northern and Western Verkhoyansk regions is analyzed. The genus dominating in the Asselian-Sakmarian deposits of the Verkhoyansk Region is Jakutoproductus, which is represented by species Jakutoproductus verkhoyanicus (Fredericks), J. crassus Kaschirzew, J. talchanensis Makoshin, J. lenensis Makoshin, characterizing the Khorokytian Horizon, and J. insignis Abramov et Grigorjeva, J. terechovi Zavodowsky and J. rugosus Ganelin, characterizing the Echian Horizon. In all the sections studied, division into biostratigraphic zones was revealed, with the most complete zonal sequence established in the Northern Verkhoyansk Region – in the lower reaches of the Lena River (Kubalakh section, northeast of the Kharaulakh Ridge) and in the basin of the Sobolokh-Mayan River (Orulgan Ridge). In the Kuranakh subzone, the diachronicity of the boundary of the Khorokyt and Echij Formations is revealed. The most important marker of the boundary of the Khorokytian and Echian Horizons is the appearance of the Sakmarian species J insignis Abramov et Grigorjeva in the section. This species has a wide geographic and narrow vertical distribution; it is characterized by the presence of a direct ancestor – the species J. lenensis Makoshin in the underlying sediments (in the terminal part of the Khorokytian Horizon). The appearance of the species J insignis Abramov et Grigorjeva occurred at the initial stage of the Echian transgression simultaneously with the replacement of the Khorokytian ammonoid association by Arkachanian ammonoid association.

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