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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 ...
The dodo became extinct during the mid-to-late 17th century due to habitat destruction, overhunting, and predation by introduced mammals. [1] It is an often-cited example of a human-driven extinction. [2] The Holocene extinction, or Anthropocene extinction, [3] [4] is the ongoing extinction event caused by humans during the Holocene epoch.
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.
The Morrison Formation is the best source of Jurassic mammal fossils in North America. [67] Local dinosaurs included the ornithopod Camptosaurus, the sauropods Apatosaurus and Diplodocus, and the theropod Allosaurus. [68] Unlike many periods of geologic history the Jurassic did not end in a mass extinction.
1926 [ 415 ] Extermination campaign. The Great Plains wolf has been later determined to be continuous morphologically [ 410 ] and genetically [ 416 ] with the still existing Mexican wolf, which would use the name C. l. nubilus if placed in the same subspecies, due to being the older one. Red-moustached fruit dove.
The reason that a number of groups went extinct in North America but lived on in South America (while no examples of the opposite pattern are known) appears to be that the dense rainforest of the Amazon basin and the high peaks of the Andes provided environments that afforded a degree of protection from human predation. [168] [n 25] [n 26]
Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya). [1]The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
Tennessee, Cumberland, Ohio, and Wabash River systems [ 192 ] Extinct in 1936 due to loss of habitat through impoundment or channelization. [ 8 ] Sampson's pearly mussel. Epioblasma sampsonii. Kentucky, Illinois, and Indiana [ 193 ] Extinct in the 1930s or 1940s due to habitat destruction and fragmentation.