The Coulterville 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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Coulterville’s center stands about 1,710 ft above sea level. Within three miles the land runs from 770 ft to 3,330 ft, a difference of 2,560 ft: mountain country. The highest named summit within 15 miles is Pilot Peak, about 5,980 ft, 15 miles east-northeast.
Under the town center the state geologic map shows Undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided) (mafic-volcanic, greenstone), from the Paleozoic to Mesozoic, 66 to 542 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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Argillite, quartzite, phyllite. Age: Ordovician to Triassic, 202 to 487 million years old. About 10 mi of the line.
Mafic-volcanic. Age: Jurassic, 145 to 202 million years old. About 8 mi of the line.
Slate, graywacke. Age: Triassic to Late Jurassic, 145 to 252 million years old. About 4 mi of the line.
Mafic-volcanic, greenstone. Age: Paleozoic to Mesozoic, 66 to 542 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 Coulterville reaches San Francisco Bay and the Pacific Ocean by way of Lake McClure, the Merced, the San Joaquin and New York Slough: about 200 river miles.
Lake on the way: Lake McClure.
120 miles of the trip are on the San Joaquin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Coulterville; river miles along the main stem, rounded.
