The Dover 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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Dover’s center stands about 1,930 ft above sea level. Within three miles the land runs from 1,090 ft to 2,710 ft, a difference of 1,620 ft: steep hill country. The highest named summit within 15 miles is Stratton Mountain, about 3,940 ft, 12 miles north-northwest.
The section below crosses 26 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Amphibolite, greenstone. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 3 mi of the line.
Phyllite, limestone. Age: Silurian to Early Devonian, 394 to 425 million years old. About 2 mi of the line.
Schist. Age: Mesoproterozoic, 1.2 to 1.4 billion years old. About 2 mi of the line.
Gneiss. Age: Mesoproterozoic, 1.2 to 1.6 billion years old. About 2 mi of the line.
Phyllite, mica-schist. Age: Silurian to Early Devonian, 394 to 425 million years old. About 2 mi of the line.
Quartz-feldspar-schist, granofels. Age: Cambrian to Early Ordovician, 471 to 542 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. 20 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 Dover reaches Long Island Sound and the Atlantic Ocean by way of Ellis Brook, the North Branch Deerfield, the Deerfield and the Connecticut: about 190 river miles.
120 miles of the trip are on the Connecticut.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dover; river miles along the main stem, rounded.
