The Haynesville 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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Haynesville’s center stands about 400 ft above sea level. Within three miles the land runs from 370 ft to 540 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Peekaboo Mountain, about 1,090 ft, 8 miles southeast.
Under the town center the state geologic map shows Silurian undifferentiated pelites and sandstones (slate, sandstone), from the Silurian, 422 to 445 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Quartzite, calc-silicate-rock. Age: Silurian to Devonian, 359 to 445 million years old. About 8 mi of the line.
Slate, sandstone. Age: Silurian, 422 to 445 million years old. About 6 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 4 mi of the line.
Mudstone, sandstone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 3 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 3 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 Haynesville reaches the Atlantic Ocean by way of the Mattawamkeag and the Penobscot: about 130 river miles.
85 miles of the trip are on the Penobscot.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Haynesville; river miles along the main stem, rounded.
