Results 11 to 20 of about 15,420 (250)

Jurassic to Paleogene: Part 2 Paleogene geochronology and chronostratigraphy

open access: yesGeological Society, London, Memoirs, 1985
Summary We present a revised Paleogene geochronology based upon a best fit to selected high temperature radiometric dates on a number of identified magnetic polarity chrons (within the late Cretaceous, Paleogene and Neogene) which minimizes apparent accelerations in sea-floor spreading.
Berggren, William A.   +2 more
openaire   +4 more sources

The Paleogene Period [PDF]

open access: yes, 2012
ABSTRACT All Paleocene stages (i.e., Danian, Selandian and Thanetian) have formally ratified definitions, and so have the Ypresian and Lutetian Stages in the Eocene, and the Rupelian Stage in the Oligocene. The Bartonian, Priabonian and Chattian Stages are not yet formally defined.
N. Vandenberghe   +7 more
core   +6 more sources

Large Igneous Province Record Through Time and Implications for Secular Environmental Changes and Geological Time‐Scale Boundaries

open access: yesGeophysical Monograph Series, Page 1-26., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst   +8 more
wiley  

+12 more sources

Paleocene of Menat Formation, France, reveals an extraordinary diversity of orthopterans and the last known survivor of a Mesozoic Elcanidae [PDF]

open access: yesActa Palaeontologica Polonica, 2020
The orthopteran fauna of the Paleocene of Menat Formation (France) is revised. It comprises at least 12 species in the following clades: Grylloidea (an undescribed species, Menatgryllus longixiphus gen. et sp.
Thomas Schubnel   +4 more
doaj   +1 more source

Characteristics and sedimentary environment of organic-rich shale in the second member of Paleogene Funing Formation, Subei Basin

open access: yesShiyou shiyan dizhi, 2020
Two sets of organic-rich shales are developed in the second member of Funing Formation (E1f2) in the Subei Basin, which are E1f2shale 1 and E1f2shale 2. They are widely distributed, with rich shows and favorable shale oil conditions.
Hongliang DUAN, Shili LIU, Qian FU
doaj   +1 more source

PALEONTOLOGY AND PALEOGEOGRAPHY OF THE TETHYIAN AGGLUTINATED BENTHIC FORAMINIFERAL SPECIES OF THE GENUS SPIROPLECTINELLA [PDF]

open access: yesGeological Behavior, 2022
Thirty three small diagnostic benthic foraminiferal species of the Textulariid genus Spiroplectinella are common in the Late Cretaceous-Neogene rocks from many Tethyan localities: North Atlantic (USA, Mexico, Caribbean), South America (Brazil, Argentina,
Haidar Salim Anan
doaj   +1 more source

Paleogene benthic foraminifer biostratigraphy and paleoecology at Site 647, Southern Labrador Sea [PDF]

open access: yes, 1989
Benthic foraminifers were examined from the Paleogene of Ocean Drilling Program (ODP) Site 647 and Deep Sea Drilling Program (DSDP) Site 112 in the southern Labrador Sea.
M.A. Kaminski   +5 more
core   +1 more source

Discovery and significance of Cretaceous-Paleogene freshwater foraminifera in Subei-South Yellow Sea Basin

open access: yesShiyou shiyan dizhi, 2021
In previous studies, the "marine facies" fossils in the second member of Taizhou Formation and the second and fourth members of Funing Formation of the Subei-South Yellow Sea Basin were generally considered to be organisms associated with transgression ...
Yurui LIU
doaj   +1 more source

Using compaction simulation experiment to recover burial history: Taking the fourth Member of Shahejie Formation in Leijia area, Western Depression of Liaohe River as an example

open access: yes地质科技通报, 2021
The Leijia area in the Western Depression of the Liaohe River has good oil and gas exploration and development potential, but the current analysis of the burial history in this area lacks a clear understanding.This paper uses the recovery principle of ...
Xiaoyang Zhao   +11 more
doaj   +1 more source

New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina [PDF]

open access: yesActa Palaeontologica Polonica, 2021
In the last few years, the Quebrada de Los Colorados Formation has become an important middle Eocene fossiliferous unit in Northwestern Argentina. In this unit, the South American native ungulates were until now only represented by the order Notoungulata,
Mercedes Fernández   +6 more
doaj   +1 more source

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