A series of limestones varying in thickness from 370 to 560 feet lies between the Comanche Peak formation and the Del Rio clay in Kerr, Real, Edwards, Kimble, and Sutton counties of the Edwards Plateau region of Texas. The lower portion of the section is the Edwards limestone, which marks the top of the Fredericksburg division of the Lower Cretaceous (Comanche) in this area. The limestones lying beneath the Del Rio clay belong to the Georgetown of the lower Washita division.

Although the ages of the extremes of this series are well known, the actual contact of rocks of the...

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