The Edgerton 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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Edgerton’s center stands about 4,910 ft above sea level. Within three miles the land runs from 4,780 ft to 5,190 ft, a difference of 410 ft: hilly country. The highest named summit within 15 miles is Government Hill, about 5,530 ft, 13 miles west.
Under the town center the state geologic map shows Cody Shale (shale, siltstone), from the Late Cretaceous, 78 to 83 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 14×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, siltstone. Age: Late Cretaceous, 78 to 83 million years old. About 13 mi of the line.
Shale. Age: Paleocene, 56 to 66 million years old. About 4 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 1 mi of the line.
Sandstone, shale. Age: Paleocene, 56 to 66 million years old. About 1 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 100 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. 2 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 Edgerton reaches the Gulf of America by way of Salt Creek, the Powder River, the Yellowstone, the Missouri and the Mississippi: about 3,340 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Sharpe and Lake Francis Case.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Edgerton; river miles along the main stem, rounded.
