Several years ago, while working with the foraminifera of certain of the more refractory of the Cretaceous shales in the Rocky Mountain area, the writer found, quite by accident, a method of separating the foraminifera from these shales: the sample material was dumped by mistake into a beaker of kerosene instead of a beaker of water.

The method was described at the meeting of the A.A.P.G. Rocky Mountain Section in Denver, March, 1951, in the paper entitled, “Foraminifera in Parts of the Cretaceous in the Rocky Mountain Area.” However, many requests have been received for a written description of the...

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