User:Abyssal/Portal:Quaternary
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The Quaternary prehistory PortalIntroductionThe Quaternary (/kwəˈtɜːrnəri, ˈkwɒtərnɛri/ kwə-TUR-nə-ree, KWOT-ər-nerr-ee) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.58 million years ago to the present. As of 2023, the Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today); a third epoch, the Anthropocene, has recently been proposed, but it is not officially recognised by the ICS. The Quaternary Period is typically defined by the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused. (Full article...) Selected article on the Quaternary prehistory world and its legaciesEruptions along the narrow fissure system under the chain began in the west moat of Long Valley Caldera 400,000 to 60,000 years ago. Mammoth Mountain was formed during this period. Multiple eruptions from 40,000 to 600 years ago created the Mono Craters and eruptions 5,000 to 500 years ago formed the Inyo Craters. Lava flows 5,000 years ago built the Red Cones, and explosion pits on Mammoth Mountain were excavated in the last 1,000 years. (see more...) Selected article on the Quaternary prehistory in human science, culture and economicsThe first half of the 19th century saw paleontological activity become increasingly well organized. This contributed to a rapid increase in knowledge about the history of life on Earth, and progress towards definition of the geologic time scale. As knowledge of life's history continued to improve, it became increasingly obvious that there had been some kind of successive order to the development of life. After Charles Darwin published Origin of Species in 1859, much of the focus of paleontology shifted to understanding evolutionary paths. The last half of the 19th century saw a tremendous expansion in paleontological activity, especially in North America. The trend continued in the 20th century with additional regions of the Earth being opened to systematic fossil collection, as demonstrated by a series of important discoveries in China near the end of the 20th century. There was also a renewed interest in the Cambrian explosion that saw the development of the body plans of most animal phyla. (see more...) Selected image
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Need help?Do you have a question about Abyssal/Portal:Quaternary that you can't find the answer to? Consider asking it at the Wikipedia reference desk. TopicsGeochronology - Quaternary (Pleistocene - Holocene) Quaternary landmasses - Major Quaternary events - Quaternary biota appearances - Fossil sites - Stratigraphic units - History - History of paleontology - Timeline of paleontology Researchers - Culture - Treatise on Invertebrate Paleontology - Vertebrate Paleontology Quality ContentFeatured Quaternary prehistory articles - Good Quaternary prehistory articles - SubcategoriesThings you can do
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