The Comobabi 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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Comobabi’s center stands about 3,200 ft above sea level. Within three miles the land runs from 2,880 ft to 4,290 ft, a difference of 1,410 ft: steep hill country. The highest named summit within 15 miles is Quinlan Mountains, about 6,830 ft, 13 miles east-southeast.
Under the town center the state geologic map shows Jurassic sedimentary and volcanic rocks (sandstone, siltstone, conglomerate), from the Middle Jurassic to Late Jurassic, 150 to 170 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Diorite, alkali-granite, granodiorite. Age: Early Jurassic to Late Jurassic, 150 to 180 million years old. About 10 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 9 mi of the line.
Conglomerate, sandstone. Age: Early Oligocene to Late Miocene, 11 to 32 million years old. About 2 mi of the line.
Basalt, andesite, dacite. Age: Middle Eocene to Late Miocene, 11 to 38 million years old. About 2 mi of the line.
Sandstone, siltstone, conglomerate. Age: Middle Jurassic to Late Jurassic, 150 to 170 million years old. About 1 mi of the line.
Gravel, sand. Age: Late Pliocene to Pleistocene, 0.8 to 3 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.
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.
