The Campo Seco 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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Campo Seco’s center stands about 560 ft above sea level. Within three miles the land runs from 210 ft to 1,080 ft, a difference of 870 ft: hilly country. The highest named summit within 15 miles is Joaquin Peak, about 2,800 ft, 11 miles southeast.
Under the town center the state geologic map shows Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains) (mafic-volcanic), from the Jurassic, 145 to 202 million years old.
The section below crosses 4 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.
Sandstone. Age: Eocene, 34 to 56 million years old. About 9 mi of the line.
Mafic-volcanic. Age: Jurassic, 145 to 202 million years old. About 8 mi of the line.
Peridotite, serpentinite. Age: Neoproterozoic to Early Jurassic, 175 to 1,000 million years old. About 3 mi of the line.
Sandstone, conglomerate. Age: Oligocene to Pleistocene, less than 34 million years old. About 3 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.
A raindrop that lands in Campo Seco reaches San Francisco Bay and the Pacific Ocean by way of Camanche Reservoir, the Mokelumne, the South Mokelumne, the San Joaquin and New York Slough: about 95 river miles.
Lake on the way: Camanche Reservoir.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Campo Seco; river miles along the main stem, rounded.
