Inoceramid and foraminiferal record and biozonation of the Turonian and Coniacian (Upper Cretaceous) of the Mangyshlak Mts., western Kazakhstan

Abstract

Walaszczyk, I., Kopaevich, L.F. and Beniamovski, V.N. 2013. Inoceramid and foraminiferal record and biozonation of the Turonian and Coniacian (Upper Cretaceous) of the Mangyshlak Mts., western Kazakhstan. Acta Geologica Polonica, 63 (4), 469-487. Warszawa. The Turonian and Coniacian (Upper Cretaceous) of the Mangyshlak Mts., western Kazakhstan, yielded a rich and relatively complete inoceramid bivalve record. The faunas and their succession correspond to those known from central and eastern Europe, allowing the zonation established in the latter areas to be applied in a virtually identical form. The gaps in the record of the group in Mangyshlak stem from the regional hiatuses in the geological record in the area and do not reflect any biogeographical differences between eastern and central-western Europe. Planktonic foraminifera are rare. Four successive interval range zones can be distinguished: in ascending stratigraphic order, the Helvetoglobotrunaca helvetica, Marginotruncaca pseudolinneiana, Marginotruncana coronata, and Concavotruncana concavata zones. Their correlation with the inoceramid zonation and, consequently, with the chronostratigraphic scheme, is demonstrated. The zonation and chronostratigraphic subdivision as applied in Mangyshlak may easily be applied to other areas of the peri-Caspian region (Caucasus, Tuarkyr, Kopet-Dagh, SE margin of the East-European Craton).

The Coniacian–Santonian sedimentary record in southern Tanzania (Ruvuma Basin, East Africa): Planktonic foraminiferal evolutionary, geochemical and palaeoceanographic patterns

“…Globotruncanita appears slightly above the appearance of D. asymetrica , in agreement with observations from the Transitional Province (Exmouth Plateau, Petrizzo, ), while in the Tethyan Ocean (Tunisia, Robaszynski et al ., ; Italy, Coccioni & Premoli Silva, ; Southern Tibet, Wendler et al ., ), the species elevata predates stuartiformis . Reasons for the apparent diachronism across latitudes of the single‐keeled taxa and of their absence in the Spanish (Lamolda & Paul, ) and peri‐Caspian Region (Kopaevich et al ., ; Walaszczyk et al ., ) records and their rarity/absence in the US Western Interior records (Gale et al ., , ) may point to the following: (i) the scattered recovery of the new evolving species because of low sampling resolution; (ii) misidentification of the ancestral species; and (iii) particular ecological preferences of the single‐keeled globotruncanids that develop and diversify in specific palaeoenvironmental conditions (i.e. cool/deep waters: Abramovich et al ., ; Falzoni et al ., , ).…”

Integrated Bio and Magnetostratigraphic Study of the «Ozerki» Sections (Upper Cretaceous, Right Bank of the Volga in the Saratov Region). Paper 2. Oryctocoenosis Characteristics and Biostratigraphy

“…и Mytiloides striatoconcentricus (Gümb. ), которые указывают на терминальные уровни турона и начало коньяка Центральной Европы и Центральной России, а также Мангышлака [14][15][16]. Нижнеконьякскими считаются виды Inoceramus seitzi And.…”

“…и I. annulatus Goldf. [14][15][16][17][18][19]. Второй комплекс, монотаксонный и более моло-дой, представлен двумя видами иноцерамусов: Sphenoceramus pachti (Arkh.)…”

“…Фораминиферы этого ком-плекса характеризуется плохой сохранностью и малым количеством, что осложняет его изучение. Вид Pseudovalvulineria vombensis в пределах ВЕП встречается в отложениях нижнего -верхнего коньяка Мангышлака [16], в породах верхнего коньяка -нижнего сантона Украины, Белоруссии и Северного Кавказа [35], среднего -верхнего ко-ньяка -нижнего сантона Среднего Поволжья [36].…”

Allostratigraphy and Biostratigraphy of the Upper Cretaceous (Coniacian-Santonian) Western Canada Foreland Basin

“…The other inoceramid taxa are: Cremnoceramus crassus inconstans (Woods, 1912) and Tethyoceramus spp. The zone is widely recognizable within the entire Euramerican biogeographic region, northern Mediterranean Province, as well as in the South Atlantic Subprovince (e.g., Marcinowski et al, 1996;Walaszczyk and Wood, 1998;Kauffman and Bengtson, 1985;Walaszczyk et al, 2010Walaszczyk et al, , 2012Walaszczyk et al, , 2013.…”