The Rapelje 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
Partly cloudy
Mostly cloudy
Showers likely
Mostly sunny
Mostly cloudy
Chance of showers
Rapelje’s center stands about 4,060 ft above sea level. Within three miles the land runs from 3,970 ft to 4,240 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Antelope Point, about 4,570 ft, 15 miles southwest.
Under the town center the state geologic map shows Bearpaw Formation (shale), from the Late Cretaceous, 72 to 84 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 17×. 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, 72 to 84 million years old. About 9 mi of the line.
Sandstone, shale, bentonite. Age: Late Cretaceous, 66 to 84 million years old. About 5 mi of the line.
Sandstone, sandstone-mudstone. Age: Late Cretaceous, 72 to 87 million years old. About 3 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 72 to 84 million years old. About 2 mi of the line.
Shale, dolostone, limestone. Age: Late Cretaceous, 87 to 90 million years old. About 2 mi of the line.
Sandstone, siltstone, shale. Age: Late Cretaceous, 84 to 87 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. 2 smaller units along the line are not listed.
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.
