The Deep River 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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Deep River’s center stands about 320 ft above sea level. Within three miles the land runs from 50 ft to 490 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is Fowler Mountain, about 790 ft, 15 miles west-northwest.
Under the town center the state geologic map shows Upper member [of Middletown Formation] (gneiss, granofels), from the Middle Ordovician, 459 to 471 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 27×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss, amphibolite. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 7 mi of the line.
Gneiss, granofels. Age: Middle Ordovician, 459 to 471 million years old. About 4 mi of the line.
Amphibolite, hornblende-gneiss. Age: Middle Ordovician, 459 to 471 million years old. About 3 mi of the line.
About 2 mi of the line.
Gneiss, granofels. Age: Middle Ordovician, 459 to 471 million years old. About 2 mi of the line.
Gneiss, schist. Age: Cambrian to Ordovician, 445 to 542 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. 6 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 Deep River reaches Long Island Sound and the Atlantic Ocean by way of the Deep River and the Connecticut: about 17 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Deep River; river miles along the main stem, rounded.
