Results 91 to 100 of about 5,414 (202)
, 1994 A borehole drilled within the Rathkenny Tract, southwest of Navan, eastern Ireland, yielded a rich graptolite fauna, including three excellent basal Silurian graptolite assemblages, from a deep-water, pelagic and hemipelagic sequence, ranging in age ...
Alan P. M. Vaughan, Alfred C. Lenz
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, 2017 The Late Ordovician Extinction Event (LOME), the first of the “Big Five” extinction events, decimated marine communities just prior to the end of the period (ca. 444 Ma).
Loxton, Jason David
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Youqicang pingjia yu kaifa, 2022 At present, the Wufeng-Longmaxi Marine high quality shale is the only case that has been commercially exploited in China. Taking Huangying section in Wulong District, Chongqing as an example, the characteristics of sedimentary geochemistry and their ...
HE Xipeng +7 more
doaj
ESTONIAN GRAPTOLITE ARGILLITES REVISITED: A FUTURE RESOURCE?
, 2014 The occurrence of Cambrian to Ordovician organic-rich black shale deposits has been known in Baltoscandia, including Estonia, for a long time. The Estonian graptolite argillite (GA) shows high to very high con- centrations of U (800 ppm), Mo (1000 ppm ...
S. Hade, A. Soesoo
semanticscholar +1 more source
The Silurian graptolite zonation of China
, 1984 China is divided into five Silurian stratigraphic regions on the basis of biostratigraphy and lithostratigraphy. These regions are: Zhungar–Xingan region, Northwest China region, Xizang (Tibet) – western Yunnan region, Yangtze region, and the South ...
Chen Xu
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Rhabdopleurid epibionts from the Ordovician Fezouata Shale biota and the longevity of cross-phylum interactions. [PDF]
Commun Biol, 2023 Nanglu K +3 more
europepmc +1 more source
, 1980 A sequence of 20 m of Wenlockian graptolite-bearing strata is described from southern Northwest Territories. The sequence is relatively rich in graptolites and represents the best Wenlockian graptolite interval yet known in the Canadian Cordillera, even
A. C. Lenz
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Research progress and challenges in thermal maturity evalution of Lower Paleozoic source rocks
Shiyou shiyan dizhiMarine source rocks in China's Lower Paleozoic are predominantly in the highly to over-mature stage. The lack of vitrinite in these strata has made thermal maturity evaluation a persistent technical challenge in deep hydrocarbon exploration.
Xiaowei ZHENG +3 more
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The Ordovician–Silurian boundary, northern Canadian Cordillera: graptolite and conodont correlation
, 1982 The Upper Ordovician graptolite facies of the northern Canadian Cordillera is divided into two biostratigraphic units, the Dicellograptus ornatus Zone and the Pacificograptus pacificus Zone. Interbedded limestone yielded conodont Fauna 12. The uppermost
A. C. Lenz, A. D. McCracken
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, 2008 To help calibrate the emerging Upper Ordovician chitinozoan biozonation with the graptolite biozonation in the Anglo-Welsh, historical type basin, the graptolite-bearing Caradoc–Ashgill successions between Fishguard and Cardigan, and at Whitland, SW ...
Vandenbroucke, Thijs +9 more
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