The Passadumkeag 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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Passadumkeag’s center stands about 140 ft above sea level. Within three miles the land runs from 110 ft to 250 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Passadumkeag Mountain, about 1,460 ft, 13 miles east-southeast.
Under the town center the state geologic map shows Silurian - Ordovician Vassalboro Formation (sandstone), from the Late Ordovician to Silurian, 428 to 459 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 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Late Ordovician to Silurian, 428 to 459 million years old. About 15 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 5 mi of the line.
Slate, sandstone. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Quartz-diorite. 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.
A raindrop that lands in Passadumkeag reaches the Atlantic Ocean by way of Onemile Brook, the Passadumkeag and the Penobscot: about 55 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Passadumkeag; river miles along the main stem, rounded.
