The other half of the Basin and Range.
In the August GEOLOGY, Christopher D. Henry of the University of Texas at Austin and J. Jorge ArandaGomez of the Universidad Nacional Autonoma de Mexico in Guanajuato present evidence that much of northern and central Mexico was stretched at the same time as regions in the United States and therefore constitutes part of the Basin and Range. They suggest that the province runs all the way to the city of Oaxaca, south of Mexico City, more than 3,000 kilometers from the far end of the province in northern Nevada.
Geologists believe the distinctive topography of this province formed when extensional forces caused some blocks of crust to drop lower than others, creating high mountain ranges and low basins. Henry says scientists must recognize the true extent of the province before they can begin to understand what caused the extension, beginning about 30 million years ago.
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|Title Annotation:||Great Basin in Nevada and Western Utah may also include parts of northern and central Mexico|
|Article Type:||Brief Article|
|Date:||Sep 5, 1992|
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