The Livermore 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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Livermore’s center stands about 430 ft above sea level. Within three miles the land runs from 370 ft to 1,050 ft, a difference of 680 ft: hilly country. The highest named summit within 15 miles is Speckled Mountain, about 2,160 ft, 14 miles west-northwest.
Under the town center the state geologic map shows Silurian Sangerville Formation, Patch Mountain member (marble), from the Silurian, 428 to 445 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 13×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metasandstone. Age: Silurian, 434 to 445 million years old. About 6 mi of the line.
Shale, sandstone. Age: Silurian, 428 to 434 million years old. About 6 mi of the line.
Metasandstone, pelitic-schist, metasiltstone. Age: Early Devonian, 394 to 422 million years old. About 4 mi of the line.
Gabbro, diorite, ultramafic. Age: Carboniferous, 299 to 359 million years old. About 3 mi of the line.
Marble. Age: Silurian, 428 to 445 million years old. About 2 mi of the line.
Marble. Age: Silurian, 428 to 445 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 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 Livermore reaches the Atlantic Ocean by way of Ford Brook, the Martin Stream, the Nezinscot, the Androscoggin and the Kennebec: about 90 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Livermore; river miles along the main stem, rounded.
