Campanian-Maastrichtian Nannoplankton biostratigraphy of the Narsapur claystone Formation, Krishna-Godavari Basin, India

摘要

Nannoptankton biostratigraphy of the Campgniiin - Mansukhtian 870 metre thick argilla-ceous subsurface sediments below the Lowest vrep of Narsnpur area, Kiishna-Guiavari Basin has been presented in the paper. These infratr&ppnin sediments are assigned to hiicula murus and Arkhangcl.tkislla cymbifcrmis zones of Late Maastrichtian age and undi fferentiated CC 1C -. CC 23 nannoplankion i&nes of the Campanian age. Occurt ence of global Late Maastriehtlan marker Micula murus just below the lowest trap is significant and considered to be important short lived ramno-event in Late Maastricbtian times. The initiation of oldest volcanic eruption in the Narsapur area is aiound 67.0 Ma. (middle of Micula murus zone) and it is correlated with tia lowest limit of the Deccar. vdcmsm in Razole area.