The structures of the MFTB are exposed by to later generally East-West trending large-scale crustal extension in the Miocene, through what is known to geologists as the Colorado River Extensional Corridor
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In 1914, the California Southern Railroad (not to be confused with the earlier railroad linking Barstow and San Diego) was incorporated to build 42.2 miles from a point known as Blythe Junction (Rice) to reach Blythe via a passage between the Big Maria Mountains and the Little Maria Mountains.