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The area is characterized by a series of low-relief Jurassic horsts and graben .
A graben is a down-dropped block of the crust resulting from extension, or pulling, of the crust.
Earlier workers typically regarded the Messaras basin as a simple east-west-trending graben .
The fault discovered by the team begins near the Swiss Jura mountains south of Basel and extends nearly five miles northeasterly through the Rhine graben , a valley near the city's southern edge.
These faults bound horsts, grabens and tilted blocks.
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