Biostratigraphy of the Cenomanian-Turonian boundary in the Eastern Carpathians (Dâmboviţa Valley): preliminary observations

Abstract

ABSTRACT. Planktonic and benthic foraminiferal assemblages from an Upper Albian to Lower Turonian interval in the East Carpathians were investigated in a well and in an outcrop from the Stoeneşti -Cetăţeni area (Dâmboviţa Valley), Romania. The benthic foraminiferal extinction that occurred at the Cenomanian/Turonian boundary and the first stage of the faunal recovery are documented here for the first time in the Romanian Carpathians. Bioevents and changes in the foraminiferal record from this area show that low oxygen conditions occured already in the Late Cenomanian, as suggested by the presence of radiolarian-rich shales. Impoverished assemblages of small, thin walled agglutinated foraminifera are present in the lowermost Turonian after the benthic-free interval corresponding to the "Bonarelli Level". Calcareous nannofossils are also documented from this level in the well from the Stoeneşti locality.

Biostratigraphic Revision of Middle-Cretaceous Biostratigraphy Succession in South Zagros Basin

“…Permoli Silva and Verga [16] have marked Whiteinella paradubia (Sigal) from Mid-Cenomanian through to MidConiacian, whereas Keller and Pardo [43] have reported this species from the Upper Cenomanian strata of the Greenhorn formation of Colorado (USA). The biostratigraphic results of Cetean et al [44] are similar to the work of Permoli Silva and Verga [16] who studied the eastern Carpathians. Based on the mentioned work, it confirmed the Late Cenomanian age of biozone Calcisphaerula innominata and Whiteinella paradubia Assemblage Zone.…”

Pliocene agglutinated benthic Foraminifera from Site U1341 in the Bering Sea (IODP Expedition 323)

“…This morphotype is known to be the dom i nant one in hypoxic con di tions such as in the modern Cal i for nia Bor der lands Bas ins (Kaminski et al, 1995), under the OMZ off West Af rica (Kender et al, 2008a, b;, or in as so ci a tion with Up per Cre ta ceous dysoxic shales (B¹k, 2006;Cetean et al, 2008). The dom i nant spe cies (Martinotiella sp.…”

Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys

“…However, Rhizammina is also considered an opportunistic taxon as, in some records, there is evidence that it thrived under low oxygen content (e.g., Kaminski and Kuhnt, 1995;Cetean et al, 2008).…”

“…Some taxa of the epifaunal or shallow infaunal morphogroups are considered opportunistic due to tolerated high-to low-oxygen conditions (Jorissen et al, 2007). This opportunistic groups include the genera Haplophragmoides, Glomospira (Kuhnt and Kaminski, 1989;Koutsoukos and Hart, 1990;Rückheim et al, 2006;Cetean et al, 2008;Reolid et al, 2008), and Lenticulina Tyska, 1994;Reolid et al, 2008;Koch and Friedrich, 2012).…”