Donald M. Allen’s discussion of our paper published in the April Bulletin has been read with special interest because he assisted with the examination of samples from the three wells drilled by the Montana-Dakota Utilities Company. He probably did not know that the cores and cuttings from the Porcupine Dome well (No. 4 of Figure 1 of our paper) were restudied by Mr. West in 1938 from 2,137 to 3,215 feet, and in part to 3,650 feet. The location of this well, midway between the Big Snowy sections and the Baker region, made it particularly important for correlation purposes. We...
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