The Cameron Park 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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Cameron Park’s center stands about 1,220 ft above sea level. Within three miles the land runs from 920 ft to 1,640 ft, a difference of 720 ft: hilly country. The highest named summit within 15 miles is Negro Hill, about 2,520 ft, 13 miles east-northeast.
Under the town center the state geologic map shows Mesozoic gabbroic rocks, unit 2 (undivided) (diorite, gabbro), from the Triassic to Cretaceous, 66 to 252 million years old.
The section below crosses 9 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.
Mafic-volcanic. Age: Jurassic, 145 to 202 million years old. About 9 mi of the line.
Diorite, gabbro. Age: Triassic to Cretaceous, 66 to 252 million years old. About 4 mi of the line.
Slate, graywacke. Age: Triassic to Late Jurassic, 145 to 252 million years old. About 3 mi of the line.
Schist, gneiss. Age: Paleoproterozoic to Cretaceous, 66 to 2,500 million years old. About 2 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Argillite, quartzite, phyllite. Age: Ordovician to Triassic, 202 to 487 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 smaller units along the line are not listed.
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 Cameron Park reaches San Francisco Bay and the Pacific Ocean by way of Deer Creek, the Cosumnes, the Mokelumne, the South Mokelumne, the San Joaquin and New York Slough: about 95 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cameron Park; river miles along the main stem, rounded.
