The Eastbrook 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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Eastbrook’s center stands about 180 ft above sea level. Within three miles the land runs from 130 ft to 480 ft, a difference of 350 ft: rolling country. The highest named summit within 15 miles is Lead Mountain, about 1,480 ft, 15 miles north-northeast.
Under the town center the state geologic map shows Devonian alkali feldspar granite (alkali-feldspar-granite), 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 35×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Alkali-feldspar-granite. Age: Devonian, 359 to 422 million years old. About 10 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 6 mi of the line.
Slate, schist, quartzite. Age: Middle Ordovician to Late Ordovician, 450 to 470 million years old. About 4 mi of the line.
Sandstone, limestone. Age: Ordovician to Devonian, 359 to 487 million years old. About 1 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 0.6 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.
A raindrop that lands in Eastbrook reaches the Atlantic Ocean by way of Mill Brook, Webb Brook and the Union: about 30 river miles.
Lake on the way: Graham Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Eastbrook; river miles along the main stem, rounded.
