The Carroll 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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Carroll’s center stands about 850 ft above sea level. Within three miles the land runs from 510 ft to 1,060 ft, a difference of 550 ft: hilly country. The highest named summit within 15 miles is Musquash Mountain, about 1,230 ft, 12 miles east.
Under the town center the state geologic map shows Ordovician unnamed felsic volcanic rocks (felsic-volcanic), from the Ordovician, 445 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Felsic-volcanic. Age: Ordovician, 445 to 487 million years old. About 10 mi of the line.
Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Mudstone. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Quartz-monzonite. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Mudstone. Age: Ordovician, 445 to 487 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.
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 Carroll reaches the Atlantic Ocean by way of Lindsey Brook, the Baskahegan Stream, the Mattawamkeag and the Penobscot: about 160 river miles.
Lake on the way: Baskahegan Lake.
85 miles of the trip are on the Penobscot.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Carroll; river miles along the main stem, rounded.
