Paleozoological Division of Pleistocene Marine Basins on Arctic Coast of Eurasia: ABSTRACT

Abstract

Stratigraphic and paleontologic data on the Pleistocene marine transgressions make it possible to establish biogeographic regions and subregions in the late glacial (interstadial), ultimate, and penultimate interglacial stages. Morphologic stability of species suggests that the ecology was unchanged, and that the zoogeographical units established recently by Z. A. Filatova can be used for reconstruction. In nearshore zones of Mindel-Riss sea basins (Stor, Holstein, North, Kolvin-Padymey, Sanchugovka, Pinakul seas), the northern limit of the Atlantic middle boreal subregion was near Denmark, the high boreal subregion was in the eastern part of the Pechora Land, and the low arctic boundary was on the right tributaries of the Yenisey River. The Pacific boreal region extended to the west coast of Bering Strait. Open shelves were inhabited by low arctic mollusks on the western side of Eurasia; east from the Kanin Peninsula there lived high arctic species now distributed in the Eurasian marine province (fauna with Propeamussium groenlandicum, Bathyarca, and Cuspidaria). In the Riss-Wurm (Eem, Boreal, Kazantzevo, Val'katlen) seas, the boundaries of the Atlantic middle boreal and high boreal subregions were in the North Dvina River basin and on the Pyasina River, respectively. The Atlantic low arctic subregion was connected with the Pacific. A province with a Portlandia fauna was present in the eastern Baltic. In the Bolling-Allerod stage, middle boreal mollusks were distributed as far north as Bergen; high boreal mollusks reached Tromso and the Danish Straits. Pacific low arctic species were displaced to 175°W long. The Mindel, Riss, and Wurm seas were inhabited by arctic mollusks along the entire coast. End_of_Article - Last_Page 2510------------