The Kerby 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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Kerby’s center stands about 1,380 ft above sea level. Within three miles the land runs from 1,230 ft to 2,850 ft, a difference of 1,620 ft: steep hill country. The highest named summit within 15 miles is French Peak, about 5,530 ft, 14 miles southeast.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Peridotite, serpentinite. Age: Paleozoic to Jurassic, 145 to 542 million years old. About 8 mi of the line.
Mudstone, graywacke. Age: Late Jurassic, 153 to 164 million years old. About 6 mi of the line.
Metaandesite, metabasalt, spilite. Age: Triassic to Jurassic, 145 to 252 million years old. About 6 mi of the line.
Mudstone, graywacke. Age: Late Jurassic, 153 to 164 million years old. About 1 mi of the line.
Andesite. Age: Late Jurassic, 145 to 164 million years old. About 1 mi of the line.
Gravel, boulders, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Kerby reaches the Pacific Ocean by way of the Illinois and the Rogue: about 80 river miles.
50 miles of the trip are on the Illinois.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Kerby; river miles along the main stem, rounded.
