The Jacksonville 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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Jacksonville’s center stands about 1,650 ft above sea level. Within three miles the land runs from 1,160 ft to 2,070 ft, a difference of 910 ft: steep hill country. The highest named summit within 15 miles is Mount Snow, about 3,600 ft, 13 miles north-northwest.
The section below crosses 14 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist. Age: Early Devonian, 394 to 422 million years old. About 6 mi of the line.
Paragneiss. Age: Neoproterozoic, 938 to 969 million years old. About 6 mi of the line.
Granofels. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 2 mi of the line.
Mica-schist, phyllite. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 2 mi of the line.
Schist. Age: Early Devonian, 394 to 422 million years old. About 2 mi of the line.
Quartz-feldspar-schist, quartzite, phyllite. Age: Early Ordovician to Middle Ordovician, 459 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. 8 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 Jacksonville reaches Long Island Sound and the Atlantic Ocean by way of the East Branch North, the Deerfield and the Connecticut: about 160 river miles.
120 miles of the trip are on the Connecticut.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jacksonville; river miles along the main stem, rounded.
