The Bushnell 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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Bushnell’s center stands about 4,870 ft above sea level. Within three miles the land runs from 4,820 ft to 5,120 ft, a difference of 300 ft: rolling country.
Under the town center the state geologic map shows Ogallala Group or Formation (siltstone-mudstone, conglomerate-sandstone), from the Miocene, 5.3 to 23 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 39×. 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-mudstone, conglomerate-sandstone. Age: Miocene, 5.3 to 23 million years old. About 21 mi of the line.
Gravel. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, claystone, conglomerate. Age: Late Miocene, 5.3 to 12 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.
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 Bushnell reaches the Gulf of America by way of Lodgepole Creek, the South Platte, the Platte, the Missouri and the Mississippi: about 2,320 river miles.
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 Bushnell; river miles along the main stem, rounded.
