منابع مشابه
Biogeographic and bathymetric determinants of brachiopod extinction and survival during the Late Ordovician mass extinction.
The Late Ordovician mass extinction (LOME) coincided with dramatic climate changes, but there are numerous ways in which these changes could have driven marine extinctions. We use a palaeobiogeographic database of rhynchonelliform brachiopods to examine the selectivity of Late Ordovician-Early Silurian genus extinctions and evaluate which extinction drivers are best supported by the data. The f...
متن کاملClimate change and the selective signature of the Late Ordovician mass extinction.
Selectivity patterns provide insights into the causes of ancient extinction events. The Late Ordovician mass extinction was related to Gondwanan glaciation; however, it is still unclear whether elevated extinction rates were attributable to record failure, habitat loss, or climatic cooling. We examined Middle Ordovician-Early Silurian North American fossil occurrences within a spatiotemporally ...
متن کاملIdentifying the most surprising victims of mass extinction events: an example using Late Ordovician brachiopods
Mass extinction events are recognized by increases in extinction rate and magnitude and, often, by changes in the selectivity of extinction. When considering the selective fingerprint of a particular event, not all taxon extinctions are equally informative: some would be expected even under a 'background' selectivity regime, whereas others would not and thus require special explanation. When ev...
متن کاملDid a gamma-ray burst initiate the late Ordovician mass extinction?
Gamma-ray bursts (hereafter GRB) produce a flux of radiation detectable across the observable Universe. A GRB within our own galaxy could do considerable damage to the Earth's biosphere; rate estimates suggest that a dangerously near GRB should occur on average two or more times per billion years. At least five times in the history of life, the Earth experienced mass extinctions that eliminated...
متن کاملLate Ordovician geographic patterns of extinction compared with simulations of astrophysical ionizing radiation damage
Abstrac.t-Based on the intensity and rates of various kinds of intense ionizing radiation events such as supernovae and gamma-ray bursts, it is likely that the Earth has been subjected to one or more events of potential mass extinction level intensity during the Phanerozoic. These induce changes in atmospheric chemistry so that the level of Solar ultraviolet-B radiation reaching the surface and...
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ژورنال
عنوان ژورنال: Estonian Journal of Earth Sciences
سال: 2023
ISSN: ['1736-7913', '1406-0132', '1736-7557', '1736-4728']
DOI: https://doi.org/10.3176/earth.2023.29