Title

A. Ya. Berger, E. O. Kovalevskaya Yu. I. Tesakov, V. G. Khromykh

Border Ordovician and Silurian deposits in the interfluve area of Olenek, Markha, and Morkokh (northeast of the Siberian Platform)

Some general data of the Silurian and Ordovician sequences in the Olenek, Markha and Morkoka interfluve are given. Lithological characteristics of boundary stratons of the said systems, composition of their oryctocoenoses and paleontological complexes dating the age are specified.
Key words: Ordovician, Silurian, stratigraphic subdivision.