The The Forks 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.
The Forks’s center stands about 590 ft above sea level. Within three miles the land runs from 560 ft to 1,480 ft, a difference of 920 ft: steep hill country. The highest named summit within 15 miles is Coburn Mountain, about 3,700 ft, 12 miles northwest.
Under the town center the state geologic map shows Silurian The Forks Formation (metasiltstone), from the Silurian, 422 to 428 million years old.
The section below crosses 12 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.
Mudstone. Age: Devonian, 359 to 422 million years old. About 11 mi of the line.
Melange. Age: Cambrian, 487 to 542 million years old. About 5 mi of the line.
Sandstone. Age: Early Devonian, 410 to 414 million years old. About 2 mi of the line.
Quartzite. Age: Cambrian to Ordovician, 445 to 542 million years old. About 2 mi of the line.
Metasiltstone. Age: Silurian, 422 to 428 million years old. About 0.9 mi of the line.
Mudstone, sandstone. Age: Early Devonian, 410 to 414 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 6 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 The Forks reaches the Atlantic Ocean by way of Kelly Brook and the Kennebec: about 140 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of The Forks; river miles along the main stem, rounded.