The Lake Mystic 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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Lake Mystic’s center stands about 150 ft above sea level. Within three miles the land runs from 30 ft to 190 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Undifferentiated sediments (sand, clay), from the Pleistocene to Holocene, less than 2.6 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 10 mi of the line.
Sand, clay. Age: Pliocene, 2.6 to 5.3 million years old. About 5 mi of the line.
Sand. Age: Late Pliocene, 2.6 to 3.6 million years old. About 4 mi of the line.
Clay, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, limestone. Age: Middle Miocene, 12 to 16 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 Lake Mystic reaches the Gulf of America by way of Outside Lake and the Apalachicola: about 70 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Mystic; river miles along the main stem, rounded.
