Foraminifers and radiolarians across the Albian-Cenomanian and Cenomanian-Turonian Boundaries (Northern Peri-Tethys)

Cenomanian–Campanian (Late Cretaceous) planktonic assemblages of the Crimea–Caucasus area: Palaeoceanography, palaeoclimate and sea level changes

“…Cenomanian and Cenomanian-Turonian boundaries in these areas have been studied by Vishnevskaya (1991), Alekseev et al (1997, Kopaevich and Kuzmicheva (2002), Vishnevskaya et al (2006Vishnevskaya et al ( , 2013a and Kopaevich (2008, 2014).…”

“…Thalmanninella appenninica IRZ and can be correlated with the late Albian Crolanium cuneatum Bed of the Russian Platform the Alievium superbum Bed (Vishnevskaya and Agarkov, 1998) was attributed to the Alievium superbum Zone proposed by Pessagno (1976) for the Turonian, and which was identified in the Crimean sections (Bragina, 2004(Bragina, , 2009aVishnevskaya et al, 2006) as well as in the successions of the Russian Platform (Vishnevskaya, 2010). Assemblage IV (sample X-17-71)…”

“…The late Cretaceous radiolarian assemblages from the successions of the Crimea have been previously studied by Bragina (1999), Vishnevskaya (2001), Bragina (2004), Bragina andBragin (2006), Vishnevskaya et al (2006), Vishnevskaya and Kopaevich (2007), Vishnevskaya and Kurilov (2007), Bragina (2009aBragina ( , b, 2011. The Cenomanian-Turonian transition of Selbukhra has been described by Bragina and Bragin (2007).…”

“…The Turonian radiolarian assemblage of the Crimea, belong to the Alievium superbum Radiolarian Zone (Pessagno, 1976), and occurs above (see Vishnevskaya et al, 2006) an anoxic level that is present in the Aksudere, Selbukhra and Belaya sections (Fig.6). …”

“…The Cenomanian assemblages from the Crimea (15 samples from Selbukhra and 3 samples from Belaya) and the Great Caucasus (2 samples from Bacsan and 1 sample from Urukh) include more than 50 species (Vishnevskaya et al, , 2006Bragina, 1999Bragina, , 2004Bragina, , 2014 with an hyperspherical abdomen (Figs. 6,7,9,11).…”