Re: [Geology2] Zion National Park Shows Evidence Of Earthquakes That Rattled Dinosaurs

Utterly fascinating!

On Fri, Aug 30, 2013 at 6:51 AM, Lin Kerns <linkerns@gmail.com> wrote:

 

Zion National Park Shows Evidence Of Earthquakes That Rattled Dinosaurs

Date: Aug 29, 2013 | Author: Joelle Renstrom 

A new study conducted by scientists at the University of Nebraska in Lincoln confirms that the red cliffs of Zion National Park in Utah were the result of an earthquake that ripped through North America during the early Jurassic period. That was just under 200 million years ago, if you're counting, or more importantly, the period often characterized by the presence of dinosaurs.

This massive earthquake tore through the expansive sand sea of North America (which at that time was part of Pangaea, the single supercontinent), disturbing the water-soaked sand buried below and causing it to erupt through the sand like a volcano or geyser. Archaeologists have found evidence of these blowouts in the Navajo Sandstone of the American Southwest. The sand sea, or Jurassic dune field, occupied nearly 250,000 square miles, from Wyoming to California, for roughly 15 million years.

<SNIP>

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