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[QUOTE]Originally posted by DD'eDeN: [QB] http://www.nature.com/articles/srep26374 Pleistocene footprints show intensive use of lake margin habitats by Homo erectus groups Here we present data from 481 fossil tracks from northwestern Kenya, including 97 hominin footprints attributed to Homo erectus. These tracks are found in multiple sedimentary layers spanning approximately 20 thousand years. Taphonomic experiments show that each of these trackways represents minutes to no more than a few days in the lives of the individuals moving across these paleolandscapes. The geology and associated vertebrate fauna place these tracks in a deltaic setting, near a lakeshore bordered by open grasslands. Hominin footprints are disproportionately abundant in this lake margin environment, relative to hominin skeletal fossil frequency in the same deposits. Accounting for preservation bias, this abundance of hominin footprints indicates repeated use of lakeshore habitats by Homo erectus. Clusters of very large prints moving in the same direction further suggest these hominins traversed this lakeshore in multi-male groups. Such reliance on near water environments, and possibly aquatic-linked foods, may have influenced hominin foraging behavior and migratory routes across and out of Africa. - - - Some quotes from "Pleistocene footprints show intensive use of lake margin habitats by Homo erectus groups": This sedimentary sequence was deposited by rel.low-energy fluvial & shallow-lacustrine processes on a deltaic lake margin. The fossil tracks are located on multiple discrete, bedded silt layers, found throughout the 20-ka sequence & on the Ileret Tuff layer itself. Many prints preserve fine detail, e.g. ridges between the toes, indicative of mud that was both plastic & firm enough to retain shape after the tracks were formed. Typically, tracks were infilled by fine or silty sand, prior to deposition of the following silt layer. In some cases, this depositional couplet was repeated multiple times. No soil development or root traces occur within the footprint layers: these surfaces were quickly buried after the tracks were emplaced. Taphonomic experiments on Hs footprints made on muds along the shores of Lake Turkana show that on average human footprints retain fine detail for 1.3 days. This is consistent with data from non-hominin fauna in similar environments. [/QB][/QUOTE]
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