The Van Horn 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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Van Horn’s center stands about 4,050 ft above sea level. Within three miles the land runs from 3,930 ft to 4,410 ft, a difference of 480 ft: hilly country. The highest named summit within 15 miles is Tumbledown Mountain, about 5,790 ft, 8 miles north-northwest.
Under the town center the state geologic map shows Alluvial fan deposits (coarse-detrital), from the Pleistocene to Holocene, less than 2.6 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 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.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 10 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Limestone. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 3 mi of the line.
Conglomerate, sandstone. Age: Proterozoic, 542 to 2,500 million years old. About 3 mi of the line.
Arkose. Age: Proterozoic, 542 to 2,500 million years old. About 1 mi of the line.
Limestone. Age: Proterozoic, 542 to 2,500 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.
