The recognition in 1927 1 of the stratigraphic succession and structure of the formations in the east side of the Cascade Mountains suggested that an enlargement to the John Day formation might extend westward from central Oregon to and under the Cascade Mountains. Since the discovery by Condon in 1868, the study of the John Day formation has been restricted to central Oregon. Few extensions from this classical area have been found. Hence, the many studies of vertebrate forms have furnished stratigraphic data for only a portion of it. The discovery, therefore, of a large new fossiliferous area in the upper part of the formation was fortunate and may lead to important conclusions.
John C. Merriam has long since made the John Day fossils familiar and interesting to Oregonians. Therefore, when this discovery was made in the Deschutes canyon and at the base of the Cascade Mountans, it received . . .