The Lisbon 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.
Lisbon’s center stands about 340 ft above sea level. Within three miles the land runs from 300 ft to 400 ft, a difference of 100 ft: gently rolling country. The highest named summit within 15 miles is Mount Lona, about 490 ft, 10 miles south-southwest.
Under the town center the state geologic map shows Beekmantown Group (in part) (dolostone, limestone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 2 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.
Dolostone, limestone. Age: Early Ordovician, 471 to 487 million years old. About 10 mi of the line.
Dolostone. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 8 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 Lisbon reaches the St. Lawrence River by way of Brandy Brook and the Saint Lawrence: about 50 river miles. The St. Lawrence carries it on to the Atlantic.
Lake on the way: Lake Saint Lawrence.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lisbon; river miles along the main stem, rounded.