Results 191 to 200 of about 60,881 (232)
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Science, 1981
The Precambrian record is interpreted in terms of an evolutionary progression that moves in the direction of increasing continental stability. An early, highly mobile microplate tectonics phase progressed through a more stable, largely intracratonic, ensialic, mobile belt phase to the modern macroplate tectonics phase that involves large, rigid ...
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The Precambrian record is interpreted in terms of an evolutionary progression that moves in the direction of increasing continental stability. An early, highly mobile microplate tectonics phase progressed through a more stable, largely intracratonic, ensialic, mobile belt phase to the modern macroplate tectonics phase that involves large, rigid ...
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Geological Society, London, Memoirs, 1992
Abstract For much of Precambrian time, it is not possible to reconstruct any sort of meaningful palaeogeographies. For this Atlas, therefore, the earliest reconstructions are for Proterozoic intervals and are, of necessity, limited geographically.
R. Anderton, W. Gibbons, P. G. Nicholson
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Abstract For much of Precambrian time, it is not possible to reconstruct any sort of meaningful palaeogeographies. For this Atlas, therefore, the earliest reconstructions are for Proterozoic intervals and are, of necessity, limited geographically.
R. Anderton, W. Gibbons, P. G. Nicholson
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1982
Abstract Phanerozoic tectonics have not affected the basic integrity of the North American continent. From time to time, sialic crustal elements have been rifted off, accreted onto, and slipped along the continent’s margins, but the vast continental interior has remained intact.
P. F. Hoffman, K. D. Card, A. Davidson
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Abstract Phanerozoic tectonics have not affected the basic integrity of the North American continent. From time to time, sialic crustal elements have been rifted off, accreted onto, and slipped along the continent’s margins, but the vast continental interior has remained intact.
P. F. Hoffman, K. D. Card, A. Davidson
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Paleontological Journal, 2006
The appearance of Bacteria sensu lato, Eukaryota, Metaphyta, Metazoa, etc., along with the oxygenization of the atmosphere, are shown to have occurred much earlier than was previously assumed. Paleontological data clearly indicate that the difference between surface temperature of the Earth in the Archaen and now was no more than 30°C.
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The appearance of Bacteria sensu lato, Eukaryota, Metaphyta, Metazoa, etc., along with the oxygenization of the atmosphere, are shown to have occurred much earlier than was previously assumed. Paleontological data clearly indicate that the difference between surface temperature of the Earth in the Archaen and now was no more than 30°C.
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