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Midwest geologists propose new view of ancient continental collisions

ites. The Precordillera formed before the Andes and contains fossils which are similar to those found in North America, but very different from those found elsewhere in South America.

In the revised model, the Precordillera land mass could have come from North America or simply been in a similar environment (tropical to semi-tropical).

If it did break or rift away from the North American land mass (known as Laurentia), Huff said the rift must have occurred well before the mid-Ordovician collisions. He also noted that the rifting would be consistent with what's known about the eastern United States.

"It's a very broken up continent," said Huff. "The Appalachians stop abruptly near Birmingham, Alabama. Part of the Appalachians are probably part of Africa today. The east coast has a history of this kind of fracturing."


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Contact: Chris Curran
chris.curran@uc.edu
513-556-1806
University of Cincinnati
13-Nov-2000


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