The South Browning 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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South Browning’s center stands about 4,380 ft above sea level. Within three miles the land runs from 4,260 ft to 4,800 ft, a difference of 540 ft: hilly country. The highest named summit within 15 miles is Bison Mountain, about 7,800 ft, 15 miles west-southwest.
Under the town center the state geologic map shows Glacial deposit (unconsolidated), from the Pleistocene to Holocene, less than 1.8 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 13×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Pleistocene to Holocene, less than 1.8 million years old. About 22 mi of the line.
Shale, dolostone, limestone. Age: Late Cretaceous, 84 to 100 million years old. About 0.9 mi of the line.
Sandstone. Age: Late Cretaceous, 66 to 72 million years old. About 0.8 mi of the line.
Sandstone, siltstone, shale. Age: Late Cretaceous, 72 to 87 million years old. About 0.6 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 South Browning reaches the Gulf of America by way of Depot Creek, Willow Creek, Cut Bank Creek, the Marias, the Missouri and the Mississippi: about 3,460 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Fort Peck and Lake Sharpe.
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 South Browning; river miles along the main stem, rounded.
