The Chemult 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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Chemult’s center stands about 4,770 ft above sea level. Within three miles the land runs from 4,710 ft to 5,380 ft, a difference of 670 ft: hilly country. The highest named summit within 15 miles is Mount Thielsen, about 8,930 ft, 15 miles west-southwest.
Under the town center the state geologic map shows Mazama ash-flow deposits (dacite, andesite), from the Holocene, less than 12,000 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 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dacite, andesite. Age: Holocene, less than 12,000 years old. About 19 mi of the line.
Dacite, andesite. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Basalt, andesite. Age: Miocene to Holocene, less than 23 million years old. About 0.5 mi of the line.
Basalt. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 0.5 mi of the line.
Basaltic-andesite, basalt. Age: Quaternary, less than 2.6 million years old. About 0.4 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.
