The graywacke sandstone here was deposited in a near shore environment. Now there is vegetation change as black oak, Ponderosa pine, and some sugar pines are seen. On the right are pillow lavas, formed undersea 150 mya. Vegetation includes manzanita, sugar pine and Scotch broom ground cover. Transition zone vegetation before the alpine zone.
Foothill pines grow on serpentine, which is toxic to most vegetation.
We pass through Weimar, where there are faults and the roadcuts of slate show the layering of the old seafloor. This Mariposa Fm has folding and where there was less heat some seashells can be found. The first fossils found in the Sierra Nevada were found here by railroad builders between 1867 and 1869. Mile 28 the Gillis Hill fault. Vegetation include incense cedar and native bigleaf maple.