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Showing 1 to 20 of 41 for “"Turonian"”.
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TURONIAN DINOFLAGELLATE CYST ASSEMBLAGES FROM SOUTHERN ENGLAND
… and the resulting biostratigraphy from the Turonian of southern England. Sampling (every 1-2m) of the whole succession from three areas (Dover, Sussex and the Isle of Wight), together with sedimentological and macropalaeontological detail provided a good basis for what is primarily a …
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Turonian (Late Cretaceous) Ostracoda from Dover, south-east England
… assemblages from samples collected through the Turonian Stage of the Late Cretaceous from Dover, Kent, south-east England, consist of one hundred and three species group taxa. These are described and illustrated. This represents a significant increase in the knowledge of the Turonian fauna, …
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Cyclostratigraphy And Sedimentation Of The Cenomanian-Turonian Tuscaloosa Marine Shale
<p>A cyclostratigraphic and geochemical analysis was conducted on the basal high resistivity zone of the Tuscaloosa Marine Shale to determine if orbital forcing is apparent in mineralogical data suites. Geochemical data suites obtained via x-ray diffraction from five cored wells located near the …
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High-precision U/Pb dating of the Cenomanian-Turonian boundary Kaiparowits Plateau, Utah
… marine species turnover at the Cenomanian-Turonian boundary is associated with Oceanic Anoxic Event 11 (OAE II) and is often identified by an increase of a13C in the carbon isotopic record. A high-precision chronology of the Cenomanian- Turonian boundary is needed to better constrain the …
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Characterization of Cenomanian-early Turonian bentonites in southwestern Saskatchewan through lithostratigraphy and chemostratigraphy analysis
… This thesis outlines studies of Cenomanian-early Turonian bentonite across southwestern Saskatchewan, with an aim not only to document these, but to rigorously test whether bentonite can help in refining the regional stratigraphic framework of an area. Specifically, bentonite occurring within the …
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Foraminiferal and stable isotope investigation of the Cenomanian-Turonian extinction and oceanic anoxic event
… change, particularly around the Cenomanian-Turonian Boundary (CTB) (93.5 Ma). The mid-Cretaceous is considered to mark a period of intense global warming related to widespread tectonic activity, leading to periods of high sea level and no polar ice. This had great effects on the ocean's …
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Sequence stratigraphic relationships and facies architecture of Turonian-Campanian strata, Kaiparowits Plateau, south-central Utah
Includes bibliographical references (volume 2 pages 279-315).
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The petrology of clay-rich beds in the Turonian (Upper Cretaceous) of the Anglo-Paris Basin
Clay-rich beds ('marl bands') in the Turonian of the Anglo-Paris Basin are primary features reflecting a sudden, sharp increases in non-carbonate deposition on the sea-floor. They differ from omission surfaces because they are not rhythmic, and usually only occur during eustatic falls in sea level. …
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Turonian inoceramids and biostratigraphy of the Sergipe Basin, northeastern Brazil: an integrated study of the Votorantim and Nassau quarries
… biostratigraphical survey was carried out in the Turonian (Upper Cretaceous) of the Sergipe Basin, northeastern Brazil, on the basis of bed-by-bed collecting of inoceramids, ammonites and other macrofossil groups from the Votorantim (locality Retiro 26) and Nassau (locality Mata 11) quarries in …
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Phytoplankton productivity and Milankovitch Cycles in the Cenomanian-Turonian Bridge Creek member of the Greenhorn Formation in southeastern Colorado
Statistical analyses of palynomorph assemblages from the Upper Cretaceous Bridge Creek Member (Greenhorn Formation) near Pueblo, Colorado suggest that the micritic limestone/organic rich-shale cycles of the Bridge Creek may have been caused by a combination of fluctuating primary productivity and …
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Sedimentary and ecosystem response to Late Cretaceous (Cenomanian - Turonian) paleoenvironmental events along the eastern margin of the Western Interior Seaway, Canada.
… to these deposits, the uppermost Cenomanian to Turonian record along the eastern margin is characterized by rich planktic foraminiferal assemblages. Proximal and distal assemblages record a changing environment with frequent catastrophic perturbations including ashfalls and expansion of the …
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The Middle to Late Cretaceous microbiostratigraphy (foraminifera) and lithostratigraphy of the Cauvery Basin, Southeast India
… Albian and (2) from the late Cenomanian to mid-Turonian, when anoxic conditions developed in the Basin. These anoxic events record major taxonomic changes in the planktonic foraminiferal assemblage. The study shows that the anoxic events had a major affect on the microfaunal community and that …
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Palaeoenvironmental analysis of the upper Cenomanian and lower Turonian limestone beds in the Sergipe Basin, northeastern Brazil, based on microfacies analysis, micropalaeontology and stable isotopes
Die Kalksteinschichten des oberen Cenoman- unteren Turon (mittlere Kreide) des Sergipe Beckens in Nordost-Brasilien, wurden bezüglich des Paläoenvironments und der Mikrofazies untersucht. Die Mikrofauna wurde auf ihre biostratigraphische Verwendbarkeit analysiert und zur Interpretation des …
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Geochemical signatures of black shales deposited during Oceanic Anoxic Event 2 (Cenomanian/Turonian) in the tropical Atlantic (Demerara Rise, ODP Leg 207) and in northern Germany (Wunstorf
Diese Studie präsentiert eine anorganisch-geochemische Untersuchung von zwei Sedimentabfolgen des Ozeanischen Anoxischen Ereignisses 2 (OAE 2) unterschiedlicher paläogeografischer Standorte. Am Demerara Rise (ODP Leg 207; tropischer Atlantik) sind die Sedimente, die während OAE 2 abgelagert wurden, …
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POPULATION DYNAMICS AND GEOCHEMISTRY OF BENTHIC AND PLANKTONIC FORAMINIFERA TO INTERPRET THE PALEOCEANOGRAPHIC CHANGES ACROSS THE CENOMANIAN-TURONIAN OCEANIC ANOXIC EVENT 2 AT LOW AND HIGH LATITUDES
… the Earth’s history, namely the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE 2). It is globally marked by a positive δ13C excursion due to the deposition and burial of large amounts of organic matter in the ocean. The exact causes of OAE 2 are still studied but it is understood that it …
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The sedimentology, palaeoecology and stratigraphy of cretaceous rocks in N.W. Scotland
… Gribun Chalk Formation, and an Early - IVliddle Turonian age for the Str2thaird Limestone Formation. The most refined biostratigraphical range for the Beinn Iadain lVIudstone F'ormation was Albian to Palaeocene. The IVlid-Late Cretaceous development of the Inner Hebrides Basin includes two …
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A seismic stratigraphic analysis and petroleum system characterization of the cretaceous sequence in central Walvis basin, offshore Namibia
… area. Source rocks deposited in Cenomanian to Turonian period, based on well data and modelling the Cenomanian-Turonian marine source rock is in the early maturity window with total organic carbon (TOC) levels ranging from 0.63% to 5.86%, averaging at 2.02% in the study area. Additionally, …
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Litho- and Biostratigraphic analysis of the Upper Cretaceous Carlile and Niobrara formations in southern Saskatchewan, Canada
… transgressive phase of the Niobrara cycle (early Turonian-late Santonian). The lateral distribution of these units was controlled by eustatic sea level changes and differential accommodation space generated by dynamic and flexural subsidence of the Western Interior Basin (WIB). Analyses of these …
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Applied palynology: Multidisciplinary case studies from Egypt, Gulf of Mexico and USA
… section from northern Egypt is Cenomanian to Turonian in age and records fluctuations between shallower and deeper marine conditions. The effect of these fluctuations was observed on the organic matter composition which alternates between oil and gas source rock intervals. The …
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