STRATIGRAPHY AND FORAMINIFERS FROM THE UPPERMOST CARBONIFEROUS (KASIMOVIAN-GZHELIAN) OF THE JAMANTOO AND BAIBICHETOO RANGES (MIDDLE TIEN-SHAN, KYRGYZSTAN)

摘要

Uppermost Carboniferous (Kasimovian-Gzhelian) successions from the Middle Tien-Shan are composed of over 1500 m of terrigenous and carbonate strata. The lower part of the stratigraphic section is conglomeratic and forms the 500-m-thick Minbuginskaja suite. The upper part consists of 1000 m of interbedded terrigenous and carbonate beds of the Kodzhagulskaja suite. Fossils (e.g., foraminifers, brachiopods, ammonoids, mollusks and algae) are abundant in the Kodzhagulskaja suite, but only fusulinoideans occur consistently throughout the studied sections and enable the establishment of a biostratigraphic zonation. Although fusulinoidean assemblages from the Middle Tien-Shan contain many endemic species, the presence of several more widely-distributed forms has enabled interregional correlations.