نتایج جستجو برای: late barremian

تعداد نتایج: 195650  

2002
R. Mark Leckie Timothy J. Bralower Richard Cashman

[1] Mid-Cretaceous (Barremian-Turonian) plankton preserved in deep-sea marl, organic-rich shale, and pelagic carbonate hold an important record of how the marine biosphere responded to shortand long-term changes in the ocean-climate system. Oceanic anoxic events (OAEs) were short-lived episodes of organic carbon burial that are distinguished by their widespread distribution as discrete beds of ...

Journal: :Cretaceous Research 2021

Eleven boreholes and one outcrop of the Lower Cretaceous in South Dobrogea (south-eastern Romania) were sampled for charophytes. Twenty species are described illustrated two non-marine rock units, Z?voaia Member Gherghina Formation. The contains a charophyte assemblage dominated by Feistiella bijuescensis, aff. Mesochara harrisii, Nodosoclavator bradleyi, Clavator bilateralis, grovesii var. gro...

Journal: :Journal of Asian Earth Sciences 2021

We investigated the environmental conditions that prevailed in continental ecosystems recorded sedimentary deposits of Japan during Cretaceous through analysis oxygen and carbon isotope compositions phosphate (?18Op) apatite-bound carbonate (?18Oc ?13Cc) vertebrate teeth bones. Local surface water ?18Ow values were calculated using known phosphate-water fractionation equations. Anomalously low ...

Journal: :Bulletin of the British Museum (Natural History) Geology 1993

Journal: :Open Journal of geology 2021

Non-marine Cretaceous rocks are widespread in northeastern Thailand and is well known as “the red bed” Khorat Group. The Sao Khua Formation the upper half of Group which comprised six formations. This formation was named defined at type section for between restricted PhraWihan Phu Phan drainage area Huai Khua, an intermittent stream that flows westward parallel to highway Nong Bua Lamphu UdonTh...

Journal: :Journal of South American Earth Sciences 2021

The southeastern Brazilian passive margin records a complex post-rift evolution, with two parallel high-elevation features formed after the opening of South Atlantic. We applied apatite fission track (AFT) and U–Th/He (AHe) low temperature thermochronology to constrain thermo-tectonic history Serra do Mar escarpment in area Rio de Janeiro state. New AFT central ages for basement areas collected...

2007
Ann E. L. Holbourn Michael A. Kaminski

A Valanginian to Barremian bathyal foraminiferal assemblage (118 taxa belonging to 51 genera) is documented from ODP Site 766, drilled near the foot of the Exmouth Plateau off northwest Australia. The majority of taxa are cosmopolitan species previously described from the boreal assemblages of northern Europe and the northern margins of the Tethys, but 32 taxa could not be assigned to previousl...

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