Results 1 to 10 of about 76,812 (240)
Stage boundaries, global stratigraphy, and the time scale: towards a simplification [PDF]
Carnets de géologie (Notebooks on geology), 2004 This paper examines four facets of stratigraphic terminology and usage considered faulty and proposes corrective measures. The four perfectible areas are: (1) The system of dual nomenclature requiring discrete terminologies for the superpositional and temporal aspects of rock units.
G.S. Odin +3 more
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Petroleum Exploration and Development, 2021 Based on the lithologies, sedimentary structures, graptolite zones, inorganic geochemical characteristics, electrical data of 110 shale gas wells in southern Sichuan Basin and the mineral quantitative analysis technology of scanning electron microscope, the stratigraphic sequences of the Upper Ordovician Katian Stage–Himantian Stage–Silurian Rhuddanian
Yiqing Zhu +8 more
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Rivista Italiana di Paleontologia e Stratigrafia, 2015 A refined subdivision, based on fusulinids, of the Moscovian stage in southwestern Darvaz is proposed. Seven local zones, three in the Lower Moscovian substage and four in the Upper Moscovian substage were established, based on investigations of three stratigraphic sections.
E. Ja. Leven
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Palaeoclimate evolution and sequence stratigraphy during Pliocene Shizigou stage, Qaidam Basin
Shiyou shiyan dizhi, 2020 The Qaidam Basin is a large transpressional Mesozoic to Cenozoic basin in the Tibet Plateau, West China. Since the Indosinian Movement, it has been in the subsidence stage and more than 3 trillion cubic meters of natural gas accumulated at the same time.
Qingshan LI +3 more
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High resolution stratigraphy of initial stages of rifting, Sergipe-Alagoas Basin, Brazil [PDF]
Brazilian Journal of Geology, 2017 ABSTRACT: The present work aims to characterize the Neo-Jurassic to Neocomian succession of the Sergipe-Alagoas Basin, located in northeast region of Brazil, in order to discover the influence of tectonics on sedimentation in detailed scale and thus separating this sedimentary succession in tectono-stratigraphic units.
Carrel Kifumbi +3 more
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Stratigraphy of Aptian and Albian Stages in the central part of Moesian Platform [PDF]
Geologica Balcanica, 1990 Aptian Stage is widespread in the Central North Bulgaria, while the Albian is established only in the northern regions. The Aptian sections are built up of sediments of the Trambes and Svištov Formations. It has been established that the Trâmbeš and Svištov Formation join laterally along the line Svištov-Tatari-Osilm.
Marin Ivanov, Kristalina Stoykova
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Foraminiferal stratigraphy of raised marine deposits, representing isotope stage 5, Prins Karls Forland, western Svalbard [PDF]
Polar Research, 1998 Two raised marine sequences from Prins Karls Forland, western Svalbard, interpreted to have been deposited during part of isotope substage 5e (Eemian) and substage 5a, were studied for foraminifera content. Time constraints are given by 14C ages, infrared stimulated luminescence age estimates and amino acid ratios in subfossil marine molluscs.
Helene Bergsten +2 more
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Astronomical calibration of the Toarcian Stage: Implications for sequence stratigraphy and duration of the early Toarcian OAE [PDF]
Earth and Planetary Science Letters, 2013 The Toarcian Oceanic Anoxic Event (T-OAE) of the early Jurassic period involves one of the largest perturbations of the carbon cycle in the past 250 Ma, recorded by a pronounced negative carbon-isotope excursion (CIE). Numerous studies have focused on potential causes of the T-OAE and CIE, but are hampered by an uncertain timescale.
Slah Boulila +6 more
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Integrated stratigraphy of the Waitakian‐Otaian Stage boundary stratotype, Early Miocene, New Zealand [PDF]
New Zealand Journal of Geology and Geophysics, 1999 Abstract The base of the type section of the Otaian Stage at Bluecliffs, South Canterbury, is recognised as the stratotype for the boundary between the Waitakian and Otaian Stages. Principal problems with the boundary are the restriction of existing bioevent proxies to shelf and upper slope environments and its uncertain age. These topics are addressed
Hugh E. G. Morgans +7 more
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Trans-Atlantic dinoflagellate cyst stratigraphy across the Cenomanian–Turonian (Cretaceous) Stage boundary [PDF]
Journal of Micropalaeontology, 2000 Abstract. The principal palynological proxy for the Cenomanian–Turonian Stage boundary, the top of consistent/common Litosphaeridium siphoniphorum (a dinoflagellate cyst), occurs in Greenhorn Bed 73 at the international stratotype section, west of Pueblo, Colorado, USA.
Paul Dodsworth
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