fig01.htm

Figure 1. Section of the boundary Cenomanian-Turonian beds in the Koikitau area. Notes: (1) limestone (clastic, organogenic, oolitic); (2) marl; (3) siltstone; (4) clay; (5) macrofauna locality (Sample F 1183: Sciponoceras gracile (Schumard), Kanabiceras septemseriatum (Gragin), Metoicoceras geslinianum d'Orbigny, Borrisiacoceras mirabile Arkh., Wortoceras diarianum d'Orbigny, Allocrioceras annulatum (Schumard), Scaphites sp., Praeactinocamax cf. plenus (Blainville), Microbacia coronula Goldf., Trochocyatus sp., Perrisopteria cf. fragilis Djialilov and Arustamov, Semiinvoluta sp.; Sample F 3883: Sciponoceras gracile (Schumard), Wortoceras vermiculum (Schumard), Metoicoceras geslinianum d'Orbigny, Allocrioceras annulatum (Schumard), Anisoceras plicatule Sow., Borissiacoceras planum Khakimov, Praeactinocamax plenus (Blainville); Sample F 4083: Sciponoceras cf. gracile (Schumard), Semisolarium (?) sp. ind.; Sample 1683: Mytiloides labiatus (Schloth.), ammonites; Sample F 2183/1: Mytiloides sp., Gryphaea vesiculosa turkestanica Bobkova; Sample F 2183: Mytiloides sp.; (6) Upper Cretaceous sections (6 - Koikitau section; 7 - Rovik section); I, II, IV, V - outcrop numbers; (7) northern and northeastern boundary of planktonic foraminifer distribution in the Cenomanian and Turonian.


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