The Harrington 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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Harrington’s center stands about 140 ft above sea level. Within three miles the land runs from 0 ft to 170 ft, a difference of 170 ft: gently rolling country. Open water lies within three miles. The highest named summit within 15 miles is Peaked Mountain, about 680 ft, 14 miles west.
Under the town center the state geologic map shows Devonian gabbro/diorite/ultramafic rocks - quartz diorite, from the Devonian, 359 to 422 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mafic-volcanic, felsic-volcanic. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 6 mi of the line.
Alkali-feldspar-granite. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 1 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.
Rain that falls on Harrington runs straight into the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Harrington; river miles along the main stem, rounded.
