The Lusk 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.
Lusk’s center stands about 5,050 ft above sea level. Within three miles the land runs from 4,950 ft to 5,290 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Lone Tree Hill, about 6,060 ft, 12 miles west-southwest.
Under the town center the state geologic map shows Lower Miocene and Upper Oligocene rocks or rocks equivalent to Upper and Lower Miocene rocks and White River Formation (sandstone, siltstone, claystone), from the Late Oligocene to Late Miocene, 5.3 to 28 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 16×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, siltstone, claystone. Age: Late Oligocene to Late Miocene, 5.3 to 28 million years old. About 21 mi of the line.
Sandstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 2 mi of the line.
Limestone, dolostone. Age: Late Devonian to Carboniferous, 324 to 384 million years old. About 0.3 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 Lusk reaches the Gulf of America by way of the Niobrara, the Missouri and the Mississippi: about 2,510 river miles.
Lake on the way: 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 Lusk; river miles along the main stem, rounded.