The Roxbury 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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Roxbury’s center stands about 740 ft above sea level. Within three miles the land runs from 670 ft to 2,470 ft, a difference of 1,800 ft: steep hill country. The highest named summit within 15 miles is Elephant Mountain, about 3,770 ft, 11 miles northwest.
Under the town center the state geologic map shows Devonian Carrabassett Formation (schist), from the Devonian, 359 to 422 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granodiorite. Age: Devonian, 359 to 422 million years old. About 6 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 4 mi of the line.
Mudstone, sandstone. Age: Early Devonian, 410 to 414 million years old. About 4 mi of the line.
Schist. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Metasiltstone, pelitic-schist. Age: Early Devonian, 394 to 422 million years old. About 1 mi of the line.
Sandstone, shale. Age: Silurian, 422 to 445 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 7 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.
A raindrop that lands in Roxbury reaches the Atlantic Ocean by way of the Swift, the Androscoggin and the Kennebec: about 120 river miles.
90 miles of the trip are on the Androscoggin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Roxbury; river miles along the main stem, rounded.
