The Rimrock Colony 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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Rimrock Colony’s center stands about 3,980 ft above sea level. Within three miles the land runs from 3,670 ft to 4,210 ft, a difference of 540 ft: hilly country. The highest named summit within 15 miles is Headlight Butte, about 4,180 ft, 12 miles southwest.
Under the town center the state geologic map shows Two Medicine Formation (sandstone, siltstone, mudstone), from the Late Cretaceous, 66 to 84 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 21×. 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, mudstone. Age: Late Cretaceous, 66 to 84 million years old. About 15 mi of the line.
Shale, limestone, dolostone. Age: Late Cretaceous, 84 to 90 million years old. About 4 mi of the line.
Shale. Age: Late Cretaceous, 87 to 94 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.
