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Catastrophes and Prehistory

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Author Topic: Catastrophes and Prehistory  (Read 6405 times)
Troy Exeter
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Posts: 2113

« on: March 18, 2007, 09:15:33 pm »

that is nearly coincident with the rim of the Chicxulub structure and is the only visible feature on the surface to indicate a huge crater lurks below. ...

... The explosion that produced the Chicxulub crater excavated a huge amount of material, which was then ejected upwards. Most of the debris was deposited as a blanket of material that covered North America and possible South America.  Near the impact crater the debris is tens to hundreds of meters thick, while as far away as Colorado (over 2000 km distance), the debris is still a centimeter thick ... Additional material was lofted in an expanding, vapor-rich plume that included gas from the vaporized asteroid or comet. This plume rose  far above the Earth's atmosphere, enveloping it, and eventually depositing a thin layer of debris around the entire world. ...".

According to a Miami University of Ohio web page:

"... the hi res image of the Chicxulub impact crater ...[shows]... a groove leading into the crater which shows the direction from which the asteroid or comet (rocky core type) hit. The hi res image covers the Yucatán Peninsula. Note the ejection plume pointing north and west out of the crater at the southwestern United States. ...
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