The Corwith 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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Corwith’s center stands about 1,170 ft above sea level. Within three miles the land runs from 1,150 ft to 1,180 ft, a difference of 30 ft: nearly flat ground.
Under the town center the state geologic map shows Kinderhookian formations (dolostone, limestone, siltstone), from the Early Mississippian, 347 to 359 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone, limestone, siltstone. Age: Early Mississippian, 347 to 359 million years old. About 11 mi of the line.
Shale, limestone, dolostone. Age: Late Devonian, 374 to 384 million years old. About 6 mi of the line.
Sandstone, shale. Age: Early Cretaceous to Late Cretaceous, 94 to 113 million years old. About 4 mi of the line.
Shale, siltstone. Age: Late Devonian, 359 to 374 million years old. About 1 mi of the line.
Limestone, dolostone. Age: Middle Devonian to Late Devonian, 374 to 388 million years old. About 0.8 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 Corwith reaches the Gulf of America by way of the Boone, the Des Moines and the Mississippi: about 1,700 river miles.
Lakes on the way: Roberts Creek and Big Creek Pounding Area.
1,330 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Corwith; river miles along the main stem, rounded.
