特提斯喜马拉雅雏蛤生物地层研究

Recent Approach to Buchia Biostratigraphy from the Tethyan Himalaya Area

通过藏南喜马拉雅地区聂拉木至古措地区6个剖面中雏蛤的研究,发现该地区除前人发现的晚侏罗世雏蛤外,还含有Buchiasubokensis,(在世界其他产地都出现于早白垩世地层),并研究识别出BuchiaconcentricaBuchiaspitiensis;BuchiamosquensisBuchiarugosa;BuchiafischianaBuchiablanfordiana;Buchiasubokensis4个雏蛤组合。首次记述了该区最高层位的雏蛤组合,同时,新发现的Buchiasubokensis雏蛤生物组合为藏南存在下白垩统提供了新的生物证据。

Recent collections from six sections, Lanongla area, Tethyan Himalaya allow the establishment of four buchia assemblages. In ascending order they are Buchia concentrica-Buchia spitiensis, Buchia mosquensis-Buchia rugosa, Buchia blanfordiana-Buchia piochii and Buchia subokensis assemblage. These Buchia assemblages first demonstrate that not only the Upper Jurassic strata but also the highest Buchia assemblage-Buchia subokensis are present in the Lanongla area, which appeared in Lower Cretaceous strata all over the world. This first records the highest Buchia assemblage in Lanongla area.