The Whitmore 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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Whitmore’s center stands about 2,250 ft above sea level. Within three miles the land runs from 1,500 ft to 2,760 ft, a difference of 1,260 ft: steep hill country. The highest named summit within 15 miles is Huckleberry Mountain, about 7,050 ft, 14 miles east.
Under the town center the state geologic map shows Quaternary volcanic flow rocks, unit 1 (Cascade Volcanic Field) (andesite, basalt), from the Late Pliocene to Pleistocene, less than 3.6 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Andesite. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 9 mi of the line.
Andesite, basalt. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 7 mi of the line.
Andesite, basalt. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 6 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 0.9 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 Whitmore reaches San Francisco Bay and the Pacific Ocean by way of Mill Creek, South Cow Creek, Cow Creek and the Sacramento: about 300 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Whitmore; river miles along the main stem, rounded.
