Before considering the correlation of the Bend formation it is necessary to recognize that the Bend is two things, not one, that it is divided by an important unconformity and that the lower part is of Mississippian while the upper part is of Pennsylvanian age. Though it was rather clearly intimated in the Llano-Burnett folio published in 1912, that an unconformity occurs within the body of the Bend formation, the statement seems largely to have been lost sight of and it was not practicable in a publication of that type to give the subject the consideration which it perhaps deserved....
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