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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.
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.
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.
Map of North America. This is a list of North American animals extinct in the Holocene that covers extinctions from the Holocene epoch, a geologic epoch that began about 11,650 years before present (about 9700 BCE) [A] and continues to the present day. [1] Recently extinct animals in the West Indies and Hawaii are in their own respective lists.
Mammonteus primigenius Osborn, 1924. Elephas boreus Hay, 1924. The woolly mammoth (Mammuthus primigenius) is an extinct species of mammoth that lived from the Middle Pleistocene until its extinction in the Holocene epoch. It was one of the last in a line of mammoth species, beginning with the African Mammuthus subplanifrons in the early Pliocene.
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 ...
The latest Pleistocene of North America records a large extinction phase that resulted in the disappearances of over 30 genera of mammals, the majority of which are considered "megafauna" (~45 kg (99 lb) or larger). Mammut was one of the many genera recorded within North America whose extinction causes are currently unresolved. [168]