Abstract
New paleontological and lithological data characterizing the upper boundary of the Chekurovskii Formation are considered for the stratoregion located in the lower reaches of the Lena River, northern Siberia. We propose to accept this boundary at the bottom of a sandy bed with pebbles, considering the latter to be basal sandstones of an overlying transgressive sequence. Taking into account ammonite records, we can conclude that the boundary corresponds to a level within the Upper Bathonian Catacadoceras barnstoni Zone. The predominantly silt–sized sediments lying above (uppermost Bathonian? – Lower Callovian) can be treated an analogue of a lower part of the Innokent’evka Formation recognized in adjacent facial region.
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