The Ophir 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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Ophir’s center stands about 6,590 ft above sea level. Within three miles the land runs from 5,700 ft to 9,490 ft, a difference of 3,790 ft: mountain country. The highest named summit within 15 miles is Flat Top Mountain, about 10,580 ft, 4 miles east.
Under the town center the state geologic map shows Miocene volcanic rocks, undivided (felsic-volcanic), from the Late Oligocene to Middle Miocene, 12 to 28 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 12 mi of the line.
Sandstone. Age: Carboniferous to Permian, 273 to 324 million years old. About 5 mi of the line.
Clay. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Limestone. Age: Early Mississippian to Late Mississippian, 324 to 359 million years old. About 2 mi of the line.
Felsic-volcanic. Age: Late Oligocene to Middle Miocene, 12 to 28 million years old. About 1 mi of the line.
Dolostone, limestone. Age: Middle Cambrian, 497 to 521 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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.
