The Mount Chase 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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Mount Chase’s center stands about 1,330 ft above sea level. Within three miles the land runs from 770 ft to 1,970 ft, a difference of 1,200 ft: steep hill country. The highest named summit within 15 miles is Mount Chase, about 2,430 ft, 1 miles northeast.
Under the town center the state geologic map shows Ordovician unnamed volcanic rocks (mafic-volcanic, felsic-volcanic), from the Ordovician, 445 to 487 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mafic-volcanic, felsic-volcanic. Age: Ordovician, 445 to 487 million years old. About 10 mi of the line.
Sandstone, mudstone. Age: Early Cambrian, 521 to 542 million years old. About 5 mi of the line.
Slate, sandstone. Age: Silurian, 422 to 445 million years old. About 4 mi of the line.
Conglomerate. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Quartz-diorite. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Chert, banded-iron-formation. Age: Ordovician, 445 to 487 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 Mount Chase reaches the Atlantic Ocean by way of Crystal Brook, the Fish Stream, the West Branch Mattawamkeag, the Mattawamkeag and the Penobscot: about 170 river miles.
Lake on the way: Upper Mattawamkeag Lake.
85 miles of the trip are on the Penobscot.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mount Chase; river miles along the main stem, rounded.
