The Gouldsboro 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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Gouldsboro’s center stands about 100 ft above sea level. Within three miles the land runs from 0 ft to 240 ft, a difference of 240 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Cadillac Mountain, about 1,520 ft, 13 miles southwest.
Under the town center the state geologic map shows Devonian gabbro/diorite/ultramafic rocks (gabbro, diorite, ultramafic), from the Devonian, 359 to 422 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 21×. 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 7 mi of the line.
Quartz-monzonite. Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Gabbro, diorite, ultramafic. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Mafic-volcanic, felsic-volcanic. Age: Ordovician to Devonian, 359 to 487 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. 2 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 Gouldsboro reaches the Atlantic Ocean by way of the Mill Stream: about 3 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gouldsboro; river miles along the main stem, rounded.
