The Manchester 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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Manchester’s center stands about 180 ft above sea level. Within three miles the land runs from 80 ft to 200 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Cohansey Formation (sand), from the Middle Miocene, 12 to 14 million years old.
The section below crosses 3 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.
Sand. Age: Middle Miocene, 12 to 14 million years old. About 19 mi of the line.
Clay, sand. Age: Early Miocene, 16 to 23 million years old. About 4 mi of the line.
Sand. Age: Middle Paleocene, 59 to 62 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.
A raindrop that lands in Manchester reaches the Atlantic Ocean by way of Davenport Branch, Wrangle Brook and the Toms: about 17 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Manchester; river miles along the main stem, rounded.
