_Fields Creek Road._ In the road cuts just south of the highway, the
John Day fault (Fig. 3) passes through the Mascall Formation where the
slope or dip of the beds changes abruptly from gently southward to
steeply northward. The fault continues westward under the floor of the
valley. Fossil leaves and snails can be found in the beds south of the
fault, and 1,000 feet farther south vertical Picture Gorge Basalt flows
are exposed.
To the north across the valley at the White Hills, beds of the Mascall
Formation have been dropped down against the Picture Gorge Basalt along
the Belshaw fault. The White Hills are a well-known locality for
collecting fossil leaves.