New sedimentological, bio-, and magnetostratigraphic data on the Jurassic-Cretaceous boundary interval of Eastern Crimea (Feodosiya)

LicenseCalpionellid biostratigraphy and sedimentation of the Biancone limestone from the Rudnica Anticline (Sava Folds, eastern Slovenia)

“…Calpionellids are an example of such group, owing to their uniform occurrence and diversification; as a result they are widely used in biostratigraphic analyses of the Late Jurassic and Early Cretaceous pelagic sequences throughout the Tethyan Realm (Allemann et al, 1971;Remane, 1971;Remane et al, 1986;Pop, 1974Pop, , 1994Reháková & Michalík, 1997;Lakova, et al, 1999;Boughdiri et al, 2006;Houša et al, 2007). From the point of view of calpionellid biostratigraphic potential, we note that alongside Calpionellites darderi, the index marker for the Berriasian/Valanginian stage boundary (Bulot, 1996), Calpionella alpina is considered to be most useful marker for determination of the Jurassic/Cretaceous boundary (Andreini et al, 2007;Houša et al, 2007;Wimbledon, 2008;Michalík et al, 2009;Grabowski et al, 2010a,b;Lukeneder et al, 2010;Pruner et al, 2010;Michalík & Reháková, 2011;Petrova et al, 2012;Guzhikov et al, 2012;Lakova & Petrova, 2013;López-Martínez et al, 2013, 2015Wimbledon et al, 2013Wimbledon et al, , 2017Hoedemaeker et al, 2016;Michalík et al, 2016;Svobodová & Košťák, 2016;Grabowski et al, 2017;Elbra et al, 2018 a,b;Kowal-Kasprzyk & Reháková, 2019).…”

The calcareous nannofossils and magnetostratigraphic results from the Upper Tithonian–Berriasian of Feodosiya region (Eastern Crimea)

“…The study of the Feodosiyan section began in the XIX century (Sokolov 1886;Retowski 1893) and has been reviewed in a monograph (Arkadiev et al 2012). Guzhikov et al (2012) first provided a description of the compiled Upper Tithonian-Lower Berriasian section situated at the southern edge of the town of Feodosiya within the area of Dvuyakornaya Bay Saint Ilya Cape, and Feodosiisky Cape. Later, Arkadiev et al (2018) and Baraboshkin et al (2016a) detailed the structure of the section, summarized and analysed data on bio-and magnetostratigraphic stratification of the section, and provided zonal schemes on ammonites, calpionellids, foraminifera, ostracods, dinocysts, and trace fossils.…”

Integrated stratigraphy of the Upper Barremian–Aptian sediments from the south-eastern Crimea

“…The Lower Cretaceous sediments of different intervals are studied in this area in varying degrees by different methods, including biostratigraphical, paleomagnetic, sedimentological and geochemical analyses. The main recent studies were focused on the Jurassic/Cretaceous transition (e.g., Arkadiev 2004Arkadiev , 2011Guzhikov et al 2012;Arkadiev et al 2018) and on the upper Berriasian to Valanginian sediments (Arkadiev 2007;Guzhikov et al 2014;Arkadiev et al 2017, a.o.). However, during the last half-century the Hauterivian to Aptian sediments of this area were rarely studied (e.g., Salman & Dobrovolskaya 1968;Baraboshkin 2016).…”