Abstract The Jenkyns Event or Toarcian Oceanic Anoxic was an episode of severe environmental perturbations reflected in carbon isotope and other geochemical anomalies. Although well studied the epicontinental basins NW Europe, its effects are less understood open marine environments. Here we present new (carbon isotope, CaCO 3 , [Mn]) nannofossil biostratigraphic data from Tölgyhát Kisgerecse s...

Modern hydrothermal vent communities are based on chemosynthesis by microbial primary producers. Molecular phylogenetic divergence estimates indicate that many of the dominant taxa arose during Cenozoic and Cretaceous; however, fossil record from these time periods is poor. One occurrence such Cretaceous pertains to six volcanogenic massive sulphide deposits in Troodos ophiolite Cyprus. These r...

 lnvestigations at the K/T boundary section al Zumaya, northern Spain, underline importance of this in (1) establishing a Maastrichtian ammonite zonation and (2) understanding "mass extinctions" fossil record. "Mass extinction" can be restricted to two groups oceanic surface plankton. Ammonites inoceramids exhibit gradual decline through late Cretaceous, as probably also do Temperate belem...

Abstract Herein, Ryazanian (Berriasian) macrofossils from three well cores in the Central Graben (wells B18-02, L06-02, The Netherlands) and on Jæren High (well 7/7-2, Norway) southern North Sea region are described. Macrofossils mainly represented by buchiid bivalves ( Buchia volgensis ) ammonites Surites , Lynnia Praetollia ?). genus is recorded for first time outside its topotypical area, sy...

[1] Two hypotheses have been proposed to explain simultaneous large negative excursions (up to 7% PeeDee belemnite) in bulk carbonate (dCcarb) and organic carbon isotope records (d Corg) from black shales marking the Toarcian oceanic anoxic event (T-OAE). The first explanation envisions recycling of dissolved inorganic carbon (DIC) with a light isotopic signature into the photic zone from the l...

the investigated section cropping out in kuh-e-banesh, zagros basin (southern iran) is represented by limestone, cherty beds and marllevels bearing abundant planktonic foraminifers, radiolarian microfaunas, and ammonite imprints. for the first time, well to moderatelypreserved forms of planktonic foraminifera have been extracted from black shale and marls levels. extracted biota was studied wit...