The Animas 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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Animas’s center stands about 4,410 ft above sea level. Within three miles the land runs from 4,360 ft to 4,570 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Grey Mountain, about 6,880 ft, 8 miles southwest.
Under the town center the state geologic map shows Piedmont alluvial deposits (unconsolidated), from the Pleistocene to Holocene, less than 2.6 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 11×. 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: Pleistocene to Holocene, less than 2.6 million years old. About 9 mi of the line.
Rhyolite. Age: Early Oligocene to Late Oligocene, 24 to 29 million years old. About 4 mi of the line.
Andesite, basalt. Age: Pleistocene to Holocene, less than 0.8 million years old. About 3 mi of the line.
Unconsolidated. Age: Late Pliocene to Pleistocene, 0.1 to 3.6 million years old. About 3 mi of the line.
Felsic-volcanic. Age: Late Eocene to Early Oligocene, 31 to 36 million years old. About 3 mi of the line.
Clastic, unconsolidated. Age: Late Eocene to Oligocene, 23 to 38 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.
