The Hollister plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Hollister’s center stands about 4,520 ft above sea level. Within three miles the land runs from 4,420 ft to 4,620 ft, a difference of 200 ft: gently rolling country. The highest named summit within 15 miles is Sugarloaf, about 5,750 ft, 11 miles east.
Under the town center the state geologic map shows Basalt (Pliocene and Miocene), from the Middle Miocene to Late Pliocene, 3 to 15 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt. Age: Middle Miocene to Late Pliocene, 3 to 15 million years old. About 16 mi of the line.
Rhyolite. Age: Middle Miocene to Late Miocene, 8 to 14 million years old. About 7 mi of the line.
Gravel, sand, silt. Age: Quaternary, less than 2.6 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
