Arkell.1956.Jurassic..

ANDOE ISLAND 507
The sequence begins with about 60 m. of sandstones, often rather
coarse, with seams of coal and also beds of bituminous shale and fireclay.
On the evidence of the plants the age is Middle Jurassic. Above follow
at least 325 m. of sandstone. A dark grey micaceous sandstone not more
than 150 m. above the base of the series and 90 m. above the coal beds
yields Amoeboceras alternans auct., Perisphinctes sp., Gryphaea dilatata
and other pelecypods, and is therefore Oxfordian. Above are numerous
species of Buchia and some Perisphinctids (Sokolov, 1912, pi. i), and at
the top 125 m. of shales from which a Neocomian 'Crioceras' is recorded
(Sokolov, 1912; Vogdt, 1905; Lundgren, 1894).
http://jurassic.ru/