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Petroglyphs In Nevada Are The Oldest In North America
2013-08-14 04:56:24

Petroglyphs cut into boulders in at the Winnemucca Lake site in western Nevada have been identified as the oldest known rock engravings in North America, researchers from the University of Colorado Boulder (CU-Boulder) report in a new study.


Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.