The Etna 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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Etna’s center stands about 2,940 ft above sea level. Within three miles the land runs from 2,760 ft to 5,800 ft, a difference of 3,040 ft: mountain country. The highest named summit within 15 miles is Boulder Peak, about 8,220 ft, 13 miles northwest.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 3 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.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 11 mi of the line.
Diorite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 8 mi of the line.
Melange. Age: Devonian to Jurassic, 145 to 422 million years old. About 5 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.
A raindrop that lands in Etna reaches the Pacific Ocean by way of Johnson Creek, Patterson Creek, Kidder Creek, the Scott and the Klamath: about 190 river miles.
140 miles of the trip are on the Klamath.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Etna; river miles along the main stem, rounded.
