The Hebron 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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Hebron’s center stands about 570 ft above sea level. Within three miles the land runs from 300 ft to 1,240 ft, a difference of 940 ft: steep hill country. The highest named summit within 15 miles is Mollyockett Mountain, about 2,010 ft, 15 miles north-northwest.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 17×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Carboniferous, 299 to 359 million years old. About 12 mi of the line.
Metasandstone. Age: Silurian, 434 to 445 million years old. About 5 mi of the line.
Shale, sandstone. Age: Silurian, 428 to 434 million years old. About 4 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Marble. Age: Silurian, 428 to 445 million years old. About 1 mi of the line.
Marble. Age: Silurian, 434 to 445 million years old. About 0.5 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 Hebron reaches the Atlantic Ocean by way of Middle Branch Bog Brook, Bog Brook, the Little Androscoggin, the Androscoggin and the Kennebec: about 70 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hebron; river miles along the main stem, rounded.
