Search results
Results from the WOW.Com Content Network
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.
The Pleistocene (/ ˈ p l aɪ s t ə ˌ s iː n,-s t oʊ-/ PLY-stə-seen, -stoh-; [4] [5] referred to colloquially as the Ice Age) is the geological epoch that lasted from c. 2.58 million to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations.
This is followed by a fossil gap, the next available fossil being KNM-ER 3733, a skull dated to 1.6 Ma. [16] Early Pleistocene sites in North Africa, the geographical intermediate of East Africa and Georgia, are in poor stratigraphic context. The earliest of the dated is Ain Hanech in northern Algeria (c. 1.8 [17] – 1.2 Ma [18]), an Oldowan ...
The Iowa Pleistocene snail was thought to be extinct until it was discovered in 1955 by a scientist working in northeastern Iowa. It was listed as endangered by the United States in 1978. The main cause of the snail's decline is climate change, as it is restricted to patches of cold habitat in warmer surroundings. The snail is considered to be ...
Other groups of carnivorans did not arrive in South America until much later. Dogs and weasels appear in South America about 2.9 Ma ago, but do not become abundant or diverse until the early Pleistocene. [106] Bears, cats, and skunks do not appear in South America until the early Pleistocene (about 1 Ma ago or slightly earlier). [106]
Calabrian is a subdivision of the Pleistocene Epoch of the geologic time scale, defined as 1.8 Ma—774,000 years ago ± 5,000 years, a period of ~. The end of the stage is defined by the last magnetic pole reversal (781 ± 5 Ka) and plunge into an ice age and global drying possibly colder and drier than the late Miocene through early Pliocene cold period. [4]
Marine Isotope Stage 5 or MIS 5 is a marine isotope stage in the geologic temperature record, between 130,000 and 80,000 years ago. [1] Sub-stage MIS 5e corresponds to the Last Interglacial , also called the Eemian (in Europe) or Sangamonian (in North America), the last major interglacial period before the Holocene , which extends to the ...
These include dispersal, colonisation-competition trade off and prominent examples that have been previously studied. One classic scientific model in biogeography posits that a species must continue to colonize new areas through its life cycle (called a taxon cycle ) in order to persist.