Results 21 to 30 of about 8,484 (203)

ASYNCHRONOUS DEVELOPMENT OF REEFS AND REEF-BUILDING BIOTA. PALEOZOIC

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2020
This work analyses the development of reefs, which represent thick morphologically expressed carbonate massifs created by the activity of frame-forming organisms. Major stages in the development of reefs include the periods of Early Cambrian, Ordovician,
V. G. Kuznetsov
doaj   +1 more source

Extent and duration of marine anoxia during the Frasnian– Famennian (Late Devonian) mass extinction in Poland, Germany, Austria and France [PDF]

open access: yes, 2004
– The intensity and extent of anoxia during the two Kellwasser anoxic events has been investigated in a range of European localities using amultidisciplinary approach (pyrite framboid assay, gamma-ray spectrometry and sediment fabric analysis).
Bond, D.P.G., Racki, G., Wignall, P.B.
core   +1 more source

The fossil record of early tetrapods: worker effort and the end-Permian mass extinction [PDF]

open access: yes, 2010
It is important to understand the quality of the fossil record of early tetrapods (Tetrapoda, minus Lissamphibia and Amniota) because of their key role in the transition of vertebrates from water to land, their dominance of terrestrial faunas for over ...
Bebber D.F.   +18 more
core   +3 more sources

Phylogenetic Clustering of Origination and Extinction across the Late Ordovician Mass Extinction.

open access: yesPLoS ONE, 2015
Mass extinctions can have dramatic effects on the trajectory of life, but in some cases the effects can be relatively small even when extinction rates are high.
Andrew Z Krug, Mark E Patzkowsky
doaj   +1 more source

Shared patterns in body size declines among crinoids during the Palaeozoic extinction events

open access: yesScientific Reports, 2021
Crinoids were among the most abundant marine benthic animals throughout the Palaeozoic, but their body size evolution has received little attention. Here, we compiled a comprehensive database on crinoid calyx biovolumes throughout the Palaeozoic. A model
Mariusz A. Salamon   +4 more
doaj   +1 more source

Euxinic ocean during the Late Devonian mass extinction inferred from organic compounds [PDF]

open access: yesJournal of Earth Science, 2010
There were five mass extinctions of Earth life during the past 500 million years. The second crisis of the “big five” mass extinctions occurred near the Frasnian/Famennian (F/F) boundary in the Late Devonian. This extinction impacted mainly oceanic regime and resulted in 21% of families and 50% of genera among oceanic life being wiped out (Sepkoski ...
Susumu Yatsu   +5 more
openaire   +1 more source

Late Devonian–early Carboniferous ostracods (Crustacea) from South China: taxonomy, diversity and implications

open access: yesEuropean Journal of Taxonomy, 2022
The impact of the late Devonian Hangenberg Event on ostracods is quantified for the first time from newly acquired data from the Blue Snake section, Guizhou Province, South China.
Elvis Guillam   +3 more
doaj   +1 more source

Labechia carbonaria Smith 1932 in the Early Carboniferous of England; affinity, palaeogeographic position and implications for the geological history of stromatoporoid-type sponges

open access: yesJournal of Palaeogeography, 2020
Stromatoporoid sponges were very abundant during the middle Palaeozoic Era and are thought to disappear at the end of the Devonian Period in the Hangenberg Crisis.
Stephen Kershaw, Consuelo Sendino
doaj   +1 more source

Insight into tube-building behaviour and palaeoecology of some agglutinating worms from the Upper Devonian of Nevada, USA [PDF]

open access: yes, 2015
Agglutinated worm tubes from the Upper Devonian of the Devils Gate section in Nevada, USA are reported for the first time, filling a major gap in their Palaeozoic fossil record.
Bond, David P. G., Zatoń, Michał
core   +1 more source

Gamma-ray spectrometry across the Upper Devonian basin succession at Kowala in the Holy Cross Mountains (Poland) [PDF]

open access: yes, 2003
The Upper Devonian sequence at Kowala in the Holy Cross Mountains was logged using gamma-ray spectrometry, for investigating the changes of oxygenation level in the Late Devonian basin.
Bond, D.P.G., Zaton, M.
core   +2 more sources

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