The Knox 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.
Mostly cloudy
Mostly cloudy
Partly cloudy
Mostly sunny
Mostly sunny
Mostly sunny
Partly cloudy
Knox’s center stands about 750 ft above sea level. Within three miles the land runs from 330 ft to 1,010 ft, a difference of 680 ft: hilly country. The highest named summit within 15 miles is Mount Harris, about 1,260 ft, 11 miles north-northeast.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 22×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Late Ordovician to Silurian, 428 to 459 million years old. About 9 mi of the line.
Sandstone, limestone. Age: Ordovician to Devonian, 359 to 487 million years old. About 4 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 3 mi of the line.
Slate. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 3 mi of the line.
Metasedimentary, metavolcanic. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 3 mi of the line.
Granite. Age: Devonian, 359 to 422 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. 4 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 Knox reaches the Atlantic Ocean by way of the Halfmoon Stream, the Sandy Stream, the Twentyfive Mile Stream, the Sebasticook and the Kennebec: about 100 river miles.
60 miles of the trip are on the Kennebec.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Knox; river miles along the main stem, rounded.
