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End Ordovician: 440 million years ago, 86% of all species lost, including graptolites. Late Devonian: 375 million years ago, 75% of species lost, including most trilobites. End Permian, The Great Dying: 251 million years ago, 96% of species lost, including tabulate corals, and most trees and synapsids.
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period. It includes brief explanations of the various taxonomic ranks in ...
Photosynthetic organisms appeared between 3.2 and 2.4 billion years ago and began enriching the atmosphere with oxygen. Life remained mostly small and microscopic until about 580 million years ago, when complex multicellular life arose, developed over time, and culminated in the Cambrian Explosion about 538.8 million years ago. This sudden ...
Aug. 28—As Martin Luther King Jr. addressed perhaps 250,000 people spread out before the steps of the Lincoln Monument 60 years ago today, he began with that most American of topics: money. A ...
The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses ...
TUSCARAWAS COUNTY ‒ It has been 60 years since President John F. Kennedy was assassinated in Dallas, Texas, on Nov. 22, 1963. For many people who were alive at the time, the memories remain ...
The Paleocene (IPA: / ˈpæli.əsiːn, - i.oʊ -, ˈpeɪli -/ PAL-ee-ə-seen, -ee-oh-, PAY-lee-), [ 4 ] or Palaeocene, is a geological epoch that lasted from about 66 to 56 million years ago (mya). It is the first epoch of the Paleogene Period in the modern Cenozoic Era. The name is a combination of the Ancient Greek παλαιόςpalaiós ...
It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name Eocene comes from the Ancient Greek Ἠώς (Ēṓs, " Dawn ") and καινός (kainós, "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. [ 7 ][ 8 ] The Eocene spans the time from the end of the Paleocene Epoch to the ...