| Abstrakt: |
The article describes the foraminiferal zones between Visean and Serpukhovian stage in Big Karatau. In the zones of Visean allocate Endothyranopsis compressa - Paraarchaediscus krestovnikovi, Eostaffella proikensis - Asteroarchaediscus, Eostaffella ikensis and Eostaffella tenebrosa. In Serpukhov tier detected complex area Neoarchaediscus parvus. According to new data in thin sections revealed Janischewskina delicata. Given foraminiferal zones of different sections Big Karatau. The best studied sections in the north-western part of the Big Karatau (Zhankurgan, Aktobe, Akuyuk, Zhertansay, Ushozen etc.). The development and revision of biostratigraphic units sediments Big Karatau authors is not complete, and require additional exploration of foraminifera and other organic residues in individual stratigraphic levels to a simple answer to the problems. In connection with the division of Visean substage two upper-visa is held on the sole area Endothyranopsis compressa - Paraarchaediscus krestovnikovi. Area Endothyranopsis compressa - Paraarchaediscus krestovnikovi stands in section Zhertansay, "bottom", Zhankurgan, Akuyuk, Ychozen and Aktobe. Area Eostaffella proikensis - Asteroarchaediscus recorded in the same cuts. Updated set of zones Eostaffella ikensis met sectional Zhertansay, Zhankurgan, Akuyuk, Ychozen and Aktobe. Area Eostaffella tenebrosa allocated sectional Zhertansay. Depleted zone complexes were found in sections and Zhankurgan Akuyuk. Thus, as noted above, is necessary to continue studying the border visa-Serpukhov interval in Big Karatau, especially the lower limit of the Serpukhov tier. Definition of its position and GSSP selection among the priority tasks, on which work with 2002 International Working Group of the Subcommission on Carboniferous Stratigraphy of the ISS. [ABSTRACT FROM AUTHOR] |
