The Robinson 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.
Mostly sunny
Sunny; warmer
Partly cloudy
Mostly cloudy
Chance of showers
Partly cloudy
Chance of showers
Robinson’s center stands about 1,780 ft above sea level. Within three miles the land runs from 1,740 ft to 1,820 ft, a difference of 80 ft: gently rolling country. The highest named summit within 15 miles is Wagon Wheel Hill, about 2,170 ft, 13 miles north-northeast.
Under the town center the state geologic map shows Fox Hills Formation (shale, sandstone), from the Late Cretaceous, 66 to 100 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 46×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 9 mi of the line.
Sandstone, siltstone, claystone. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 4 mi of the line.
Shale, sandstone. Age: Paleocene, 56 to 66 million years old. About 2 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.
