The Roque Bluffs 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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Roque Bluffs’s center stands about 30 ft above sea level. Within three miles the land runs from 0 ft to 180 ft, a difference of 180 ft: gently rolling country. Open water lies within three miles. The highest named summit within 15 miles is Patten Hill, about 480 ft, 14 miles northwest.
Under the town center the state geologic map shows Devonian Eastport Formation, basalt member, 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 53×. 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 3 mi of the line.
Basalt. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Mafic-volcanic, felsic-volcanic. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 0.9 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 0.9 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Devonian, 359 to 422 million years old. About 0.7 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.
Rain that falls on Roque Bluffs runs straight into the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Roque Bluffs; river miles along the main stem, rounded.
