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The extinction symbol with an X-shaped pictogram of an hourglass.The letter X stands for the first syllable of the word "extinction" Flag with the extinction symbol. The extinction symbol represents the threat of holocene extinction on Earth; a circle represents the planet and a stylised hourglass is a warning that time is running out for many species.
Permian–Triassic extinction event 252 Ma Large igneous province (LIP) eruptions [ 23 ] from the Siberian Traps , [ 24 ] an impact event (the Wilkes Land Crater ), [ 25 ] an Anoxic event , [ 26 ] an Ice age , [ 27 ] or other possible causes
Martha's Vineyard Sign Language: Sign language: Massachusetts, United States: with the death of Katie West 1951: Alsea dialect: Isolate: Oregon, United States: with the death of John Albert [160] ca. 1950: Bohemian Romani: mixed language: Czechoslovakia, Central Europe: after World War II, due to extermination of most of its speakers in Nazi ...
English: The symbol represents extinction. The circle signifies the planet, while the hourglass inside serves as a warning that time is rapidly running out for many species. The circle signifies the planet, while the hourglass inside serves as a warning that time is rapidly running out for many species.
The team analyzed combined extinction patterns using a new clumped isotope temperature record from a hiatus-free, expanded K–Pg boundary section. They documented a 7.8±3.3 °C warming synchronous with the onset of Deccan Traps volcanism and a second, smaller warming at the time of meteorite impact.
Anoxia was another mechanism of extinction; the end-Triassic extinction was coeval with an uptick in black shale deposition and a pronounced negative δ 238 U excursion, indicating a major decrease in marine oxygen availability. [154] Additional evidence for anoxia during the TJME comes from pyrite framboids, which grow in anoxic conditions. [155]
The quasi-extinction threshold, or sometimes called the quasi-extinction risk is the population size below which a species is considered to be at extreme risk of quasi-extinction. [5] This threshold varies by species and is influenced by several factors, including reproductive rates, habitat requirements, and genetic diversity.
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