The Montgomery 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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Montgomery’s center stands about 510 ft above sea level. Within three miles the land runs from 430 ft to 1,790 ft, a difference of 1,360 ft: steep hill country. The highest named summit within 15 miles is Jay Peak, about 3,810 ft, 6 miles east-northeast.
Under the town center the state geologic map shows Jay Peak Formation - schist member (phyllite, muscovite-schist, quartzite), from the Neoproterozoic to Cambrian, 487 to 1,000 million years old.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metabasalt. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 5 mi of the line.
Phyllite, muscovite-schist, quartzite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 4 mi of the line.
Muscovite-schist, gneiss, quartzite. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 4 mi of the line.
Muscovite-schist, phyllite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 3 mi of the line.
Phyllite. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Gneiss. Age: Cambrian, 487 to 542 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. 5 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 Montgomery reaches the St. Lawrence River by way of the South Branch Trout, the Trout, the Missisquoi and the Richelieu: about 170 river miles. The St. Lawrence carries it on to the Atlantic.
Lake on the way: Lake Champlain.
80 miles of the trip are on the Richelieu.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Montgomery; river miles along the main stem, rounded.
