The Balcones Escarpment is a prominent geological structure in the State of Texas. It forms the dividing line between the Gulf Coastal Plain and the Uplands of the interior. It is a line, or rather a belt, separating a segment of the earth which has settled relative to another segment on the west and north. This is, at any rate, what has happened in Post-Cretaceous times in this belt. The movements have been not only sufficiently extensive, but they must also have reached to great depths. In Travis, Williamson, Uvalde, McKinney and Medina counties the motion was accompanied with extrusions...
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