Structure of the Precambrian and Cambrian deposits in the northeast of theSiberian Platform

New deep-drilling data on the stratigraphy of the Precambrian and Cambrian deposits of the Lena-Anabar megatrough are reported. New lithostratigraphic units differing considerably in composition and structure from the coeval deposits of the natural section of the Olenek dome are recognized. The lithostratigraphic subdivision of borehole sections and their correlati on allow a uniform stratification of time CDP sections and refinement of th e structure of the Precambrian and Cambrian sections in areas characterized and not characterized by drilling. It is substantiated that the Cambrian taphrogenic assemblage is widespread in the Lena-Anabar megatrough, which is part of a single barrier-reef belt bordering the Yudoma-Olenek basin in the north and northeast. It has been f ound that the Kuoi-Daldyn rampart-like uplift continues as a paleouplift cr ossing the Lena-Anabar megatrough in a northwestern direction.