Results 211 to 220 of about 26,837 (264)

The American Oligocene

Nature, 1960
FOLLOWING from Dr. R. M. Stainforth's comments on our communication, we would direct attention to the fact that it contained merely some of the conclusions reached in our study of “Mid-Tertiary Stratigraphical Palaeontology”, which will be published as an entire, illustrated book, and it is obvious that we could not give the full background in such a ...
F. E. EAMES   +3 more
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The Oligocene bottleneck

2015
The Oligocene epoch begins at 33.9 mya. Plate tectonic reconstructions demonstrate that, for the first time, the geography of the earth largely resembled that seen today. In particular, the Atlantic and Mediterranean basins had finally achieved a modern aspect (Figures 11.1 and 11.2). Discussions of anthropoid primate origins and dispersal (Chapter 12)
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Oligocene in California?

Nature, 1965
RECENTLY, Eames, Banner, Blow and Clarke1 stated that strata of Oligocene age are missing in most of America. To support their conclusions, they noted that the Relizian Stage of California was Aquitanian in age and correlated it with the Chickasawhay Formation of the Gulf Coast region.
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Possible correlation of Oligocene climate changes with Ethiopian Oligocene ignimbrite eruptions

Arabian Journal of Geosciences, 2011
The Oligocene Ethiopian continental flood basalt province (ca. 29–31 Ma) contains significant silicic pyroclastic rocks (>60,000 km3 constituting up to 20% of the volcanic stratigraphy). Rhyolitic tephras, synchronous with the Ethiopian silicic pyroclastic rocks, are found in Indian Ocean ODP holes 711A.
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