The Roy 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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Roy’s center stands about 5,900 ft above sea level. Within three miles the land runs from 5,730 ft to 5,980 ft, a difference of 250 ft: rolling country. The highest named summit within 15 miles is Spear Hills, about 6,220 ft, 13 miles north.
Under the town center the state geologic map shows Ogallala Formation (sand), from the Middle Miocene to Early Pliocene, 3.6 to 16 million years old.
The section below crosses 5 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.
Sand. Age: Middle Miocene to Early Pliocene, 3.6 to 16 million years old. About 15 mi of the line.
Arenite, shale. Age: Early Cretaceous to Late Cretaceous, 94 to 113 million years old. About 5 mi of the line.
Sandstone, mudstone. Age: Late Triassic, 202 to 237 million years old. About 2 mi of the line.
Sandstone, shale, limestone. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 2 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 0.1 million years old. About 0.5 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.
