First find of Parabelemnopsis, the alien belemnite from the Southern Hemisphere, in the Upper Berriasian of Central Crimeaкод для вставки
First find of Parabelemnopsis, the alien belemnite from the Southern Hemisphere, in the Upper Berriasian of Central Crimea Ippolitov A.P.*, Desai B.**, Arkadiev V.V.*** *Geological Institute of Russian Academy of Sciences; Moscow, Russia **Pandit Deendayal Petroleum University, School of Petroleum Technology; Gandhinagar, India ***Saint-Petersburg State University; Saint-Petersburg, Russia Ammonite biostratigraphy of the Berriasian of Mountain Crimea and corresponding ammonite, bivalve and brachiopod assembalges (after Arkadiev et al., 2012) Despite macrofauna seems to be well-studied both systematically and stratigraphically, belemnites of the Berriasian are still out of the research focus, despite potentially they could provide a parallel biosttratigraphic scale and to improve the correlations Typical belemnites of the Berriasian of Mountain Crimea (after Weiss, 1991) (after Kabanov, 1960) (after Weiss, 1991) Typical Berriasian belemnites of Crimea are represented by the genera Duvalia, diversified Conobelus, large-sized Pseudobelus (all fam. DUVALIIDAE) and, more rarely, small-sized Hibolithes (fam. BELEMNOPSEIDAE). All known Hibolithes species posess short alveolar grooove and hastate shapes The locality The outcrops are located neaby PetrovoBarabanovo village, south of Zuya settlement, in the Fundukly ravine. The sequence is represented by intercalation of siltstones and silty limestones, containing a lot of shell debris The find: position in the section, age and principal morphological characters The rostrum is characterized by the following combination of characters: - subconical to subcylindrical shape - large elongation (PA/DV=689) - long alveolar groove - medium size (DV=8,94mm) - compressed cross-section anteriorly, round near the apex Diversity of Early Cretaceous (ValanginianHauterivian) Antarctic belemnites Belemnopsis (Parabelemnopsis) cf. madagascariensis (Besairie, 1930) (after Howlett, 1989) Variety of topotypical (s.lat.) Parabelemnopsis madagascariensis and its difference with Crimean find (after Combemorel, 1988) Other species, originally included into Parabelemnopsis Holotype of P. patagoniensis (Favre, 1908) (after Besairie, 1936) P. patagoniensis (Favre, 1908) P. casterasi (after Combemorel, 1988) Originally described as madagaskariensis by Riccardi, 1977 More Parabelemnopsis: Tibetian records around the J/K boundary P. elongata (Yin, 1975) P. regularis (Yin, 1975) P. muricatus (Chen, 1982) (after Combemorel, 1988) More Parabelemnopsis: records from the Oxfordian Undescribed species from the Oxfordian of India (previously mentioned under the name B. kuntkotensis) Original from the Spath’s collection “Hibolithes longiscissus” (after Challinor, 1989) Distribution of Parabelemnopsis spp. during the Late Jurassic and Early Cretaceous and possible migration routes to Crimea Pb – Oxfordian Pb – Kimmeridgian and Tithonian Pb – Lower Cretaceous (Be-Hau) Pb Pb Pb Pb Pb Pb Pb (after Doyle ad Howlett, 1989) South American cephalopods in the Berriasian of Crimea Parabelemnopsis cf. patagoniensis (Favre, 1908) Substeueroceras sarysuensis Arkadiev Substeueroceras ex.gr. koeneni (Steuer) Substeueroceras beneckei (Steuer) Conclusions The belemnite invasion from Gondwana recorded from the Upper Berriasian of Crimea is the first record of such type all around Europe The appearance of Parabelemnopsis cf. patagoniensis is roughly coeval with finds of ammonites of American origin (Substeueroceras) in the same geographic district, indicating that time cephalopod migrations from South America to European region were relatively common. Potentially, further attention to the Berriasian belemnites provides opportunities for establishing interregional “datum planes”. Thank you for your attention ! Our thanks to: Bogdan Zaytsev (Simferopol), Alberto Riccardi (La Plata Museum), María Beatriz Aguirre Urreta, Dario Lazo and Leticia Luci (all University of Buenos-Aires) The investigation and presentation were supported by RFBR grants No. 15-05-08767_a, 15-05-06183_a, 15-5545095-ИНД_a and DST project No. INT/RUS/RFBR/P-206.