The San Andreas Fault cuts a definitive line through this section of the Diablo Range, shaping a landscape of deep canyons and prominent ridges. Peachtree Valley serves as a central corridor, with Peachtree Rd following the drainage of San Lorenzo Cr. The terrain is characterized by a series of high points, including Monarch Peak and Austin Peak, alongside distinctive geological formations like Cleveland Rock and Banchero Rock. Numerous named canyons, such as Griswold Canyon and Blair Canyon, drain the surrounding slopes, reflecting a complex network of seasonal watercourses. This area, spanning the border of Monterey and San Benito Counties, reveals a rugged interior where ranching access and tectonic activity define the land use and topography.
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1912 · San Ardo
USGS Topo · 1:31,680
1915 · Priest Valley
USGS Topo · 1:125,000
1941 · Priest Valley
USGS Topo · 1:62,500
1941 · San Ardo
USGS Topo · 1:62,500
1943 · New Idria
USGS Topo · 1:62,500
1943 · San Ardo
USGS Topo · 1:62,500
1943 · Hernandez Valley
USGS Topo · 1:62,500
1944 · Hernandez Valley
USGS Topo · 1:62,500
1944 · Priest Valley
USGS Topo · 1:62,500
1948 · Santa Cruz
USGS Topo · 1:250,000