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The cataclysmic events that marked the end of the Permian Period some 252 million years ago were a watershed moment in the history of life on Earth.
Earth's largest mass extinction event, the end-Permian mass extinction, occurred some 252 million years ago. An estimated 90 percent of Earth's marine life was eradicated.
While the cause of the mass extinction that occurred between the Permian and Triassic periods is still uncertain, two University of Rhode Island researchers collected data that show that terrestrial biodiversity recovered much faster than previously thought, potentially contradicting several theories for the cause of the extinction.
Harsh living conditions caused by major fluctuations in the carbon content and sea levels, overacidification and oxygen deficiency in the seas triggered the largest mass extinction of all time at the end of the Permian era 252 million years ago.
DALLAS, Aug. 19, 2011 /PRNewswire/ -- Permian Basin Royalty Trust (NYSE: PBT) ("Permian") today declared a cash distribution to the holders of its units of beneficial interest of $.117780 per unit, payable on September 15, 2011, to unit holders of record on August 31, 2011.
The demise of the worldâ€™s forests some 250 million years ago likely was accelerated by aggressive tree-killing fungi triggered by global climate change.
DALLAS, July 19, 2011 /PRNewswire/ -- Permian Basin Royalty Trust (NYSE: PBT) ("Permian") today declared a cash distribution to the holders of its units of beneficial interest of $.148472 per unit, payable on August 12, 2011, to unit holders of record on July 29, 2011.
SCOTTSDALE, Ariz., July 13, 2011 /PRNewswire/ -- American Standard Energy Corp.
DENVER, June 28, 2011 /PRNewswire/ -- Cimarex Energy Co. (NYSE: XEC) announced today that it has entered into an agreement to sell for $191 million its 57.5% operated working interest in the Riley Ridge Federal Unit and gas plant located in southwestern Wyoming.
- A coin originally worth six pennies Scots, and later three; held equivalent to an English halfpenny.
- (in plural) Money; cash.