|North Pacific||AKSR-NASR||Anadyr-Koryak||Verkhoyansk-Chukotka||Okhotsk-Chukotka||N. Alaska||Yukon||Chignik|
Anadyr-Koryak Subregion (AKSR) of Northeastern Russia
This chart shows the relative positions of the phases of subregional flora evolution found in the Anadyr-Koryak Subregion of Northeastern Russia, the associated chronostratigraphy and subregional taphofloras.
Clicking on the Floras column takes you to descriptions of the different phases of floral evolution in the Anadyr-Koryak Subregion.
The Anadyr-Koryak Subregion originated in the late Albian, when part of the Kamchatka–Koryak marine basin adjacent to the OCSR volcanic highland dried. Coastal alluvial lowlands and plains of the AKSR were covered with meandering rivers, lakes and swamps. Abundant plant remains were buried in terrigenous coal-bearing alluvial, lacustrine, and palustrine deposits of the subregion. Subsequent marine transgression resulted in a shallow shelf basin with numerous islands, and shallow-water marine sedimentation covered the continental deposits. As regards AKSR floral evolution, the Early Ginter (late Albian), Grebenka (late Albian–early Turonian), Penzhina (late Turonian), Kaivayam (Coniacian), Barykov (Santonian–early Campanian), Gornorechenian (?late Campanian–early Maastrichtian), and Koryak (early–late Maastrichtian–?Danian) phases are recognised. All the late Albian–Danian floras of the AKSR, except for the oldest Early Ginter flora, are dominated by abundant and diverse angiosperms. The Early Ginter flora is regarded as a paleofloristic analogue of the Buor-Kemus flora of Northeastern Russia.