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The Cretaceous–Paleogene (K–Pg) extinction event, [ a ] also known as the K–T extinction, [ b ] was the mass extinction of three-quarters of the plant and animal species on Earth [ 2 ][ 3 ] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs. Most other tetrapods weighing more than 25 kilograms ...
Hickey and Kirk Johnson reported that after studying more than 25,000 plant fossils collected across western North America they had concluded that 79% of contemporary plants went extinct at the Cretaceous–Tertiary boundary. Hickey and Johnson embraced the idea of a catastrophic end-Cretaceous mass extinction after having previously denouncing it.
Extant or extinct (†) North American taxa whose ancestors migrated out of South America and reached the modern territory of the contiguous United States: [ n 27 ] Fish. Cichlids (Cichlidae: e.g. Texas cichlid) – freshwater fish that often tolerate brackish conditions. Amphibians.
Ectopistes migratoriaSwainson, 1827. The passenger pigeon or wild pigeon (Ectopistes migratorius) is an extinct species of pigeon that was endemic to North America. Its common name is derived from the French word passager, meaning "passing by", due to the migratory habits of the species. The scientific name also refers to its migratory ...
The End Permian extinction or the "Great ... the creation of a land bridge between North and South America). ... at high risk of extinction due to the ...
The Paleozoic (/ ˌ p æ l i. ə ˈ z oʊ. ɪ k,-i. oʊ-, ˌ p eɪ-/ PAL-ee-ə-ZOH-ik, -ee-oh-, PAY-; [1] or Palaeozoic) Era is the first of three geological eras of the Phanerozoic Eon. . Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Er
The Cretaceous (IPA: / krɪˈteɪʃəs / krih-TAY-shəss) [ 2 ] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the ...
Over 50 genera (~ 83%) of megafauna in South and North America went extinct during the Pleistocene. [41] most mega mammals (>1000kg) and large mammals (>40kg) went extinct by the end of the Late Pleistocene. [42] During this period there was a major cooling event called the Younger Dryas and the Clovis culture of capturing game became more ...