Results 181 to 190 of about 27,665 (229)
A new 'acanthothoracid' placoderm from the Arctic Canada (Early Devonian) and its bearing on the evolution of jaws and teeth. [PDF]
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Middle-Upper Devonian palynofloras from Argentina, systematic and correlation
Review of Palaeobotany and Palynology, 2018Abstract This investigation documents the first palynoassemblage spanning the Middle-Upper Devonian from four outcropping sections located in northwestern Argentina. The recovered material includes fairly well-preserved palynomorphs, both from marine and continental origin, including acritarchs, prasinophytes, cryptospores, spores and chlorophytes ...
Sol Noetinger +2 more
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Palaeogeography, Palaeoclimatology, Palaeoecology, 2021
Abstract Epibionts and hosts as well as their interactions comprise a special ecosystem in the marine hard-substrate communities which could provide paleoecological implications for the critical events of Earth history. Abundant brachiopod hosts were sampled from the Givetian–Famennian of the Longmenshan region in South China.
Xiaolin Chang +5 more
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Abstract Epibionts and hosts as well as their interactions comprise a special ecosystem in the marine hard-substrate communities which could provide paleoecological implications for the critical events of Earth history. Abundant brachiopod hosts were sampled from the Givetian–Famennian of the Longmenshan region in South China.
Xiaolin Chang +5 more
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The groundwater age in the Middle-Upper Devonian aquifer system, Lithuania
Hydrogeology Journal, 20083H, δ13C and hydrochemical data were used to estimate the corrected groundwater age derived from conventional 14C age of dissolved inorganic carbon (DIC). The Middle-Upper Devonian aquifer system from the Baltic upland recharge area in eastern Lithuania towards the discharge area on the Baltic Sea coast in the west was considered.
R. Mokrik +3 more
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Palaeomagnetism of the middle-upper Devonian Esha Ness ignimbrite, W. Shetland
Physics of the Earth and Planetary Interiors, 1985Abstract The ignimbrite division of the Esha Ness volcanics of W. Shetland has been studied palaeomagnetically. The major blocking temperature spectrum ranges between 650 and 680°C, implying that haematite is the principal remanence carrier. The magnetization build-up is simple: a minor low stability magnetization aligned along the direction of the ...
K.M. Storetvedt, T.H. Torsvik
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Palaeomagnetic properties of the Middle-Upper Devonian Volcanics of the Orkney Islands
Earth and Planetary Science Letters, 1972Abstract Thermal demagnetization and ore microscopy combined with the magnetic colloid technique and measurements of the temperature dependence of saturation magnetization have been carried out on the Middle-Upper Devonian Volcanics of the Orkney Islands.
K.M. Storetvedt, N. Petersen
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Spores and the middle-upper Devonian boundary
Review of Palaeobotany and Palynology, 1981The stratigraphic levels most favoured for the Middle-Upper Devonian boundary fall approximately within the range of the ammonoid Pharciceras lunulicosta Zone, i.e. from the Middle varcus Subzone to the base of the Lower asymmetricus Zone of the conodont scale.
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Middle-upper devonian palaeogeography of North Devon and west Somerset, England
Palaeogeography, Palaeoclimatology, Palaeoecology, 1966Abstract Most of the thick, argillaceous and arenaceous deposits of the Ilfracombe Beds and Morte Slates are considered to have accumulated in shallow-water prodelta and delta-platform environments during Givetian and Frasnian times. The thin, predominantly biostromal limestones in the Ilfracombe Beds also seem to have formed in comparatively shallow-
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About the problem of the Middle-Upper Devonian boundary in the East European Platform
Vestnik of geosciences, 2023A brief overview of the history of the identification of the Frasnian Stage (Upper Devonian) and the determination of its lower boundary in the stratotype region is presented. The characteristics of the Givetian-Frasnian boundary deposits in the East European platform and the stratigraphic significance of the regional event levels are considered ...
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Middle-Upper Devonian Clastic Wedge of the Arctic Islands
1991Abstract Carbonate deposition dominated the Franklinian miogeocline from Late Cambrian until earliest Middle Devonian. Following a transgression in early Eifelian (within the costatus-costatus conodont Zone), quartzose clastics replaced carbonates as the dominant sediment type and, from that time until Early Carboniferous, clastic ...
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