Results 221 to 230 of about 5,375 (265)

The First Data on the Callovian Ostracodes of Central Dagestan

Paleontological Journal, 2021
Callovian ostracodes (Calloviense, Jason, Coronatum, and Athleta zones) of Central Dagestan are identified and studied for the first time. The ostracode assemblage includes 9 species, one new species Pleurocythere khapissovi sp. nov. is described. Images of the previously known species are given.
L. A. Glinskikh, E. M. Tesakova
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Palaeoceanographic setting of the Callovian North Atlantic

Geological Society, London, Special Publications, 1986
Summary DSDP/IPOD Site 534 located in the Blake Bahama Basin adjacent to the Florida coast off eastern USA exemplifies the early opening stages of the North Atlantic in Callovian (mid-Jurassic) time. The earliest sediments accumulated on a rugged ocean floor located near the edge of a WNW-ESE-trending fracture zone, not
A. H. F. Robertson, J. G. Ogg
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Jurassic (callovian) paleotemperatures from Scotland

Earth and Planetary Science Letters, 1970
Abstract Isotopic paleotemperature analyses of belemnites and ammonites from the Belemnite Sands and Oxford Clay of Staffin Bay, Isle of Skye, are presented. Ammonites are depleted in18O compared with co-existing belemnites, which give mean temperatures of around 22°C, consistent with the Skye belemnite analysed by Urey et al. [1].
F.C. Tan, J.D. Hudson, M.L. Keith
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Callovian foraminiferal assemblages in West Siberia

Russian Geology and Geophysics, 2009
Abstract The paper presents data on Callovian foraminiferal assemblages from several wells in two localities of the West Siberian plain (Shaim oil and gas district, northwestern West Siberia, and Mykhpai field, central West Siberia). The assemblages are compared and studied in terms of space and time changes of their stratigraphy, which ...
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A stratigraphical revision for the English Lower Callovian

Proceedings of the Geologists' Association, 1989
Information from new and temporary sections and that from many older published sources enables a detailed revision of stratigraphical nomenclature for the Lower Callovian in England. Five formations contain rocks solely, or in part, of Lower Callovian age; the Abbotsbury Cornbrash ( nom. nov. pro Cornbrash auctt.), Cayton Clay ( nom. nov.
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The evolution of Oppel's ‘Macrocephalusbett’ (Callovian, Middle Jurassic)

Lethaia, 2017
In his basic work of 1856–1858, Albert Oppel subdivided his ‘Juraformation’ into eight stages and 32 zones. There is a long history of confusion as to the meaning of Oppel's zones. Using his ‘Macrocephalusbett’ and his ‘Zone des Amm. macrocephalus’, it is explained how his concept has been developed until today.
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New lower Callovian ostracodes from the Kursk Region

Paleontological Journal, 2009
Lower Callovian deposits (subpatruus and koenigi ammonite zones) in the Mikhailovskii Mine section (Central Russia, Kursk Region) yielded 13 ostracode species (two of them are new) belonging to ten genera. This ostracode assemblage corresponds to ostracode beds with Praeschuleridea wartae-Pleurocythere kurskensis.
E. M. Tesakova, A. S. Strezh, D. B. Gulyaev   +2 more
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Complex Estimate of Composition and Properties of Callovian Clay Minerals

Journal of Mining Science, 2002
The prospects are considered for applying the clay rocks of Callovian overburden stratum of the Mikhailovsk iron ore deposit for pelletizing. It is established that mechanochemical activation of clays favors additional dispersion and increases the specific surface, as well as exchange capacity.
T. N. Gzogyan, N. D. Mel'nikova, R. A. Altynbaev, S. R. Gzogyan   +3 more
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Marine reptiles in the callovian of European Russia

Priroda
The study of the remains of marine reptiles from the Callovian (Middle Jurassic) deposits of European Russia highlights the similarity of the herpetofauna of the Middle Russian Sea with the famous fauna of the Oxford Clay Formation of England. The Middle Russian Sea was inhabited by the pliosaurids Liopleurodon and Simolestes ; the cryptoclidid ...
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THE CORNBRASH FORMATION (CALLOVIAN) IN NORTH YORKSHIRE AND CLEVELAND

Proceedings of the Yorkshire Geological Society, 1977
SUMMARY The Cornbrash Formation comprises two main units together forming one marine cycle—the Cornbrash Limestone followed by the Shales of the Cornbrash. The formation is the expression in the Yorkshire Jurassic of the world-wide marine transgression which began in the Lower Callovian.
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