Paleogene paleogeography and the geological events at the Eocene/Oligocene boundary
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Paleogene paleogeography and the geological events at the Eocene/Oligocene boundary

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Published by Elsevier in Amsterdam .
Written in English

Subjects:

  • Geology, Stratigraphic -- Eocene -- Congresses,
  • Geology, Stratigraphic -- Oligocene -- Congresses,
  • Paleogeography -- Congresses

Book details:

Edition Notes

Other titlesPalaeogeography, palaeoclimatology, palaeoecology
Statementedited by Charles Pomerol.
ContributionsPomerol, Charles.
Classifications
LC ClassificationsQE501.4P3 P28 1981
The Physical Object
Paginationiii, 155-364 p. :
Number of Pages364
ID Numbers
Open LibraryOL18936810M

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The Oligocene (/ ˈ ɒ l. ɪ. ɡ ə. s iː n / OL-ih-ghə-seen) is a geologic epoch of the Paleogene Period and extends from about million to 23 million years before the present ( ± to ± Ma).As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The Eocene–Oligocene extinction event, the transition between the end of the Eocene ( Ma) and the beginning of the Oligocene, is marked by large-scale extinction and floral and faunal turnover (although minor in comparison to the largest mass extinctions). Most of the affected organisms were marine or aquatic in nature. They included the last of the ancient cetaceans, the Archaeoceti.   The sedimentary sequence of the Central-Carpathian Paleogene Basin provides proxy records of climatic changes related to cooling events at the Eocene/Oligocene boundary (TEE). In this basin, climatic deterioration is inferred from the demise of the carbonate platform and oligotrophic benthic biota in the SBZ19 and from the last species of warm Cited by: The geological events at the Eocene/Oligocene boundary. Palaeo- geogr., Palaeoclimatol., Palaeoecol., t~. At the end of the Eocene, series of geological events occurs on a worldwide scale, of which the intensity is comparable to the one occurring at the Cretaceous/Tertiary bound- by:

Period from - 65 million years ago. Divided into Paleogene and Neogene. Includes Paleocene, Eocene, Oligocene, Miocene, and Pliocene epochs. Part of Cenozoic Era. Characterized as following the mass extinction of the dinosaurs. The first map (Fig. 2) demonstrates the Paleocene to Lower Oligocene paleogeography and facies development. Folding in Late Cretaceous - Paleocene time produced a . Middle Eocene, Oligocene, and Lower Miocene Atlantic Coastal Plain of North Carolina By LAUCK W. WARD, DAVID R. LAWRENCE, and BLAKE W. BLACKWELDER CONTRIBUTIONS TO STRATIGRAPHY GEOLOGICAL SURVEY BULLETIN F A lithostratigraphic study of carbonate and clastic Eocene to lower Miocene rocks on the North Carolina Coastal PlainCited by: The sudden, widespread glaciation of Antarctica and the associated shift towards colder temperatures at the Eocene/Oligocene boundary (approximately 34 million years ago) (refs ) is one of the.

The Cenozoic has only two geological "periods" — the Tertiary and the Quaternary (or sometimes divided into the Paleogene and the Neogene) — but it is more helpful to speak of the geological "epochs" within these periods. The Tertiary entails the Paleocene, Eocene, Oligocene, Miocene, and Pliocene epochs.   This work presents the description of the key section of Lower Paleocene-Eocene deposits of northwestern Kamchatka, which comprises seven beds, identified on the basis of mollusk communities. In total, nearly 80 species of mollusks, which mainly belong to the thermophilic genera, were described. More than half of them were described in North American formations, which is Cited by: 4. A series of palinspastic and paleogeographic reconstructions has been made for the Pannonian and surrounding regions for five time periods: (1) Coniacian-Paleocene, (2) early-middle Eocene, (3) late Eocene-early Oligocene, (4) late Oligocene-early Miocene, and (5) late Miocene.   The Paleocene/Eocene boundary is situated in the lower part of polarity chron C24r, but its precise position and age have been contentious. Dates range from about (Berg-gren et al., b) to million years ago (Gradstein et al., ) in various reports over the past decade or so, most centering around million years ago.