Southern Siberian Mountains Kazakhstan
Geological Time: Cretaceous Upper Cretaceous Campanian
the drawings are published in the book cited below
View of a specimen of Gyroidina umbilicata (d'Orbigny, 1840)
width about 460µm
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 2-3, Fig. 7
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