USGS Open-File Report 94-588
Solved and unsolved paleogeographic problems of the sub-Arctic Pliocene of Russia
- Yuri B. Gladenkov
- Geological Institute, Russian Academy of Sciences, Moscow
Geological investigations of the Arctic coast of Russia, and the
comparative analysis of information on the Iceland-Greenland region and
the North Pacific, formed a basis for correction of paleogeographic and
paleoclimatic reconstructions.
The following events appeared to occur in the northern Holarctic:
- Climate fluctuated considerably during the Pliocene. After 3 Ma, the
cooling processes became predominant.
- The Bering Strait was opened in the middle Pliocene, but afterwards it
was repeatedly closed, providing migrations of terrestrial assemblages.
- Sea transgressions did not expand to the recent Arctic coast of
Russia?
- Marine biota migrations in the Arctic and adjacent basins were of
asymmetrical character, etc.
Some problems still remain unsolved:
- Distribution of the Pliocene marine sediments on the Arctic.
- A role of the Tule Bridge in isolation of the Arctic basin and
distribution of sea currents; its effect on the paleobiota migrations.
- A time of connection of the Arctic and Pacific basins.
- A correspondence of the eustatic and climatic fluctuations in the
Arctic Pliocene.
- Paleobiotic migrations (directions, rates, etc.) and causes of their
asymmetrical character.
- A correlation of the sub-Arctic Pliocene marine and continental
deposits.
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