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Cretaceous microfossils as indicators of cooling episodes (Boreal and Peri-Tethyan Russia)

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posted on 13.11.2019, 12:39 by V. S. Vishnevskaya, L. F. Kopaevich
S4. Palaeogeographic sketch for Early Campanian. Distribution of the foraminifera and radiolaria in the EEP and in the Crimea–Caucasus area. White colour—land, area of denudation or erosian; blue colour—marine sediments. 1—Oxytoma teniucostata (Roemer), boreal bivalve migrant from Western Siberia; 2—Marsupites testudinarius Schlotheim, crinoids from Tethys area. Calcareous benthic foraminifera of the Pseudogavelinella clementiana Zone: 3—P. clementiana (d'Orbigny); 4—Bolivinoides decoratus Jones. Planktonic foraminifera of Globotruncana arca beds on Mangyshlak MTS: 5—Globotruncana arca (Cushman); planktonic foraminifera of Globotruncanita elevata Zone in Crimea–Caucasus area: 6—Globotruncanita elevata (Brotzen). Radiolaria: 7—boreal radiolaria Prunobrachidae.