The Hanover 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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Hanover’s center stands about 640 ft above sea level. Within three miles the land runs from 610 ft to 1,660 ft, a difference of 1,050 ft: steep hill country. The highest named summit within 15 miles is Old Speck Mountain, about 4,180 ft, 14 miles west-northwest.
Under the town center the state geologic map shows Devonian - Silurian Madrid Formation (quartzite, calc-silicate-rock), from the Silurian to Devonian, 359 to 445 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 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.
Schist. Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Mudstone, sandstone. Age: Silurian, 428 to 445 million years old. About 4 mi of the line.
Granite, tonalite. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Shale, sandstone. Age: Silurian, 425 to 434 million years old. About 3 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Shale, sandstone. Age: Silurian, 425 to 434 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. 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 Hanover reaches the Atlantic Ocean by way of the Androscoggin and the Kennebec: about 120 river miles.
100 miles of the trip are on the Androscoggin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hanover; river miles along the main stem, rounded.
