<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Palaeontological data on the Caucasus are highly important for large-scale stratigraphical and palaeobiogeographical assessment of the northern Tethyan margin, but this information is often scarce and not available in English. Field studies in the Northern Caucasus have now permitted to amass some new data. Two belemnite species are described from the stratotype section of the Kamennomostskaja Formation (Callovian, Middle Jurassic) near the town of Kamennomostskij in Adygeja (Northern Caucasus). These are <italic>Belemnopsis subhastata</italic> (von Zieten, 1831) and <italic>Rhopaloteuthis ominosa</italic> Gustomesov, 1968. The latter is a rare species, and the present find allows new insights into its taxonomy. A palyno-logical analysis of the belemnite-bearing sample was carried out, and a diverse assemblage of dinocysts, acritarchs and prasinophytes, plus pollen and spores recognised. The most abundant palynomorphs are <italic>Micrhystridium</italic> and <italic>Classopollis</italic>. Data on belemnites coupled with those on palynomorphs indicate the early Callovian age of the sample level. This interpretation differs slightly from previous conclusions based on ammonites and dinocysts. If this age is correct, the degree of condensation of Callovian deposits in the section studied was lesser than previously assumed.</p></abstract>

Palaeontological data on the Caucasus are highly important for large-scale stratigraphical and palaeobiogeographical assessment of the northern Tethyan margin, but this information is often scarce and not available in English. Field studies in the Northern Caucasus have now permitted to amass some new data. Two belemnite species are described from the stratotype section of the Kamennomostskaja Formation (Callovian, Middle Jurassic) near the town of Kamennomostskij in Adygeja (Northern Caucasus). These are Belemnopsis subhastata (von Zieten, 1831) and Rhopaloteuthis ominosa Gustomesov, 1968. The latter is a rare species, and the present find allows new insights into its taxonomy. A palyno-logical analysis of the belemnite-bearing sample was carried out, and a diverse assemblage of dinocysts, acritarchs and prasinophytes, plus pollen and spores recognised. The most abundant palynomorphs are Micrhystridium and Classopollis. Data on belemnites coupled with those on palynomorphs indicate the early Callovian age of the sample level. This interpretation differs slightly from previous conclusions based on ammonites and dinocysts. If this age is correct, the degree of condensation of Callovian deposits in the section studied was lesser than previously assumed.

New data on Callovian (Middle Jurassic) belemnites and palynomorphs from the Northern Caucasus, southwest Russia

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Academician Koptyug Avenue 3, Novosibirsk 630090, Russia;

Department of Tourism, Higher School of Business, Southern Federal University, 23-ja linija Street 43, Rostov-na-Donu 344019, Russia

postal address: P.O. Box 7333, Rostov-na-Donu 344056, Russia;

Camp for Practice and Educational Tourism ’Belaja Retchka’, Southern Federal University, Nikel’ (Dakhovskaja Post Office), Majkop District, Republic of Adygeja 385792, Russia

Geologos

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Palaeontological data on the Caucasus are highly important for large-scale stratigraphical and palaeobiogeographical assessment of the northern Tethyan margin,...

New data on Callovian (Middle Jurassic) belemnites and palynomorphs from the Northern Caucasus, southwest Russia

Pubblicato online: 18 apr 2016

Pagine: 49 - 59

Ricevuto: 18 mar 2015

Accettato: 26 nov 2015

DOI: https://doi.org/10.1515/logos-2016-0004

Parole chiave
macroinvertebrates, microfossils, condensed section, Mesozoic, Adygeja

© 2016 Oksana S. Dzyuba et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

New data on Callovian (Middle Jurassic) belemnites and palynomorphs from the Northern Caucasus, southwest Russia

Pubblicato online: 18 apr 2016

Pagine: 49 - 59

Ricevuto: 18 mar 2015

Accettato: 26 nov 2015

DOI: https://doi.org/10.1515/logos-2016-0004

Parole chiavemacroinvertebrates, microfossils, condensed section, Mesozoic, Adygeja

© 2016 Oksana S. Dzyuba et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parole chiave
macroinvertebrates, microfossils, condensed section, Mesozoic, Adygeja