_Cathedral Rock._ The bluff called Cathedral Rock is the front face of a
large block of the John Day Formation that has slid from the west (Fig.
7). Inside the next horseshoe bend downstream a large mass of basalt is
tilted down against Cathedral Rock. From the highway 1.1 miles farther
north one can see the side of the tilted block along the river, and the
same two prominent red and olive-drab ash layers in the high bluff from
which the block slid. The horseshoe bend was formed as the river was
pushed eastward by the nose of the landslide.
[Illustration: Fig. 7.—View of Cathedral Rock and diagram of
landsliding.]
[Illustration: ]