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water mark, the shells, according to Stearns, offering some rather remarkable peculiarities. This cooper supposed to be Pliocene, and my trip involving some 45 miles of driving was undertaken in the hope of rediscovering this bed, but for want of a more specific location we did not succeed n finding the mark which might have been restricted to a small area. 
The Tessajara cuts a very deep channel, in the alluvial, being sometimes thirty or more feet below the surface of the alluvial and the banks nearly vertical in many places. Of this bank, ten or more feet may consist of black adobe, though often less and the rest of sandy and gravelly layers, the bed of the creek being sometimes formed by the harder sand-