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2010-11-10 10:15:00

Beginning around 542 million years ago, a profusion of animals with shells and skeletons began to appear in the fossil record. So many life forms appeared during this time that it is often referred to as the "Cambrian Explosion." Geologists at UC Santa Barbara and a team of co-authors have proposed a rethinking of the timeline of these early animal appearances. Their findings are published in the latest issue of the Geological Society of America Bulletin. Charles Darwin, in his book "On the...


Word of the Day
tessitura
  • The prevailing range of a vocal or instrumental part, within which most of the tones lie.
This word is Italian in origin and comes from the Latin 'textura,' web, structure.