East European Platform Russia
Geological Time: Jurassic Upper Jurassic Oxfordian
the drawings are published in the book cited below
width about 240µm
The identification is based upon:
Mjatliuk. E.V., 1953: Fossil foraminifera of the USSR. Spirillinidae, Rotalliidae, Epistominidae and Asterinidae. V.N.I.G.R.I. 11 271 pp. Plate 1-1, Fig. 6
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