ORDOVICIAN DEPOSITS OF THE GANYCHALAN TERRANE (PENZHINSKII RANGE OF THE KORYAK HIGHLAND)

The volume of both original and published material on the fauna, compo sition, and facies types of the Ordovician deposits of Penzhinskii Ran ge is summarized in this work. The deposits (the Elgeminai Group) repr esent a characteristic component of the Ganychalan Terrane, one of the basic structural units of the range. Five sections are considered, an d three stratigraphic units are distinguished: the Khinantykul (Arenig ian (?)early Llanvirnian), Kuyulpil (Llanvirnian-early Caradocian), an d Olenii (late Caradocian-Ashgillian) formations. The Khinantykul Form ation, mostly comprising volcanic rocks, represents an upper part of t he ophiolite association. The Kuyulpil Formation of more variable rock facies includes shallow-water elastic carbonates in northern sections and deep-water siliceous black shales in the southern sections. The O lenii Formation is fly-schoid and sandy-shaly in composition with cong lomerate horizons in its lower part. The underlying Ordovician deposit s are found to be eroded at the base of the formation, although the ma in part of its elastic material is allochthonous. The Olenii Formation reflects a period of accretion or amalgamation of the Ordovician plat e to the North American continent. The continent supplied much of the coarse elastic material derived from volcanites of the differentiated series and from the Cambrian organogenic limestones. This work is supp lemented with complete lists of conodonts and radiolarians of the Elge minai Group.