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The Late Pleistocene is an unofficial age in the international geologic timescale in chronostratigraphy, also known as the Upper Pleistocene from a stratigraphic perspective. It is intended to be the fourth division of the Pleistocene Epoch within the ongoing Quaternary Period. It is currently defined as the time between c. 129,000 and c ...
In biogeography, geodispersal is the erosion of barriers to gene flow and biological dispersal (Lieberman, 2005.; [1] Albert and Crampton, 2010. [2]). Geodispersal differs from vicariance, which reduces gene flow through the creation of geographic barriers. [3]
A map of human dispersal around the Earth. Humans arrived in South America approximately 15,000 years ago. [27] Humans arrived after the LGM. The South American deer, Hippocamelus, was known to live in high altitude locations and cold valleys. In the Pleistocene, they lived anywhere between 36.5° S and 54° S. Presently, they live between 40 ...
Like during the Triassic and Jurassic, Rhode Island's sediments were being eroded away rather than deposited during the ensuing Paleogene and Neogene periods of the Cenozoic era, leaving another gap in the state's geologic and fossil record. More recently, during the Pleistocene, Rhode Island was scoured by glaciers. [2]
The southern route dispersal is primarily linked to the Initial Upper Paleolithic expansion of modern humans and "ascribed to a population movement with uniform genetic features and material culture" (Ancient East Eurasians), which was the major source for the peopling of the Asia–Pacific region.
Until the early 1980s, early humans were thought to have been restricted to the African continent in the Early Pleistocene, or until about 0.8 Ma; Hominin migrations outside East Africa were apparently rare in the Early Pleistocene, leaving a fragmentary record of events. [4] [5]
The 775-acre (3.14 km 2) Driftless Area National Wildlife Refuge was established in 1989 to protect native flora and fauna, including endangered and threatened species such as the Iowa Pleistocene snail. [4] The refuge conserves the algific talus slope habitat and other local habitat such as cold, moist sinkholes. [4]
By the late Pleistocene, the Mississippi River Valley had formed and much of the state was a coastal plain environment. [13] Pleistocene sediments cover roughly 20% of the surface of Louisiana largely in the southern part of the state. [14] Nevertheless, fossils of this age are rare. Mollusks inhabited the state's brackish and marine waters. [15]