The Amidon 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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Amidon’s center stands about 2,900 ft above sea level. Within three miles the land runs from 2,750 ft to 3,010 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is White Butte, about 3,480 ft, 7 miles south.
Under the town center the state geologic map shows Sentinel Butte Formation (siltstone, claystone, sandstone), from the Paleocene, 56 to 66 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone, claystone, sandstone. Age: Paleocene, 56 to 66 million years old. About 17 mi of the line.
Claystone, siltstone. Age: Paleocene, 56 to 66 million years old. About 7 mi of the line.
Sandstone, limestone. Age: Oligocene to Pliocene, 2.6 to 34 million years old. About 0.4 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 Amidon reaches the Gulf of America by way of the Cannonball, the Missouri and the Mississippi: about 2,780 river miles.
Lakes on the way: Lake Oahe, Lake Sharpe, Lake Francis Case and Lewis and Clark Lake.
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 Amidon; river miles along the main stem, rounded.
