The Great Pond 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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Great Pond’s center stands about 540 ft above sea level. Within three miles the land runs from 270 ft to 770 ft, a difference of 500 ft: hilly country. The highest named summit within 15 miles is Lead Mountain, about 1,480 ft, 10 miles east-southeast.
Under the town center the state geologic map shows Devonian - Ordovician Bucksport Formation (sandstone, limestone), from the Ordovician to Devonian, 359 to 487 million years old.
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 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.
Granite. Age: Devonian, 359 to 422 million years old. About 10 mi of the line.
Sandstone, limestone. Age: Ordovician to Devonian, 359 to 487 million years old. About 5 mi of the line.
Metasedimentary, metavolcanic. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 4 mi of the line.
Alkali-feldspar-granite. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Sandstone, conglomerate. Age: Devonian to Carboniferous, 299 to 422 million years old. About 1 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 0.3 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 Great Pond reaches the Atlantic Ocean by way of the West Branch Union and the Union: about 40 river miles.
Lake on the way: Graham Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Great Pond; river miles along the main stem, rounded.
