The Horicon 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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Horicon’s center stands about 820 ft above sea level. Within three miles the land runs from 800 ft to 1,610 ft, a difference of 810 ft: hilly country. The highest named summit within 15 miles is Hoffman Mountain, about 3,680 ft, 14 miles north-northwest.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Charnockite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 8 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 4 mi of the line.
Metasedimentary, migmatite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Metasedimentary, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Gneiss, anorthosite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Paragneiss. Age: Mesoproterozoic, 1 to 1.6 billion 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. 1 smaller unit 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 Horicon reaches New York Harbor and the Atlantic Ocean by way of the Schroon and the Hudson: about 270 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Horicon; river miles along the main stem, rounded.
