The Aucilla 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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Aucilla’s center stands about 90 ft above sea level. Within three miles the land runs from 80 ft to 150 ft, a difference of 70 ft: gently rolling country. The highest named summit within 15 miles is Texas Hill, about 280 ft, 9 miles northwest.
Under the town center the state geologic map shows Hawthorn Group, Torreya Formation (sandstone, limestone), from the Middle Miocene, 12 to 16 million years old.
The section below crosses 2 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.
Sandstone, limestone. Age: Middle Miocene, 12 to 16 million years old. About 14 mi of the line.
Sand, clay, gravel. Age: Late Pliocene, 2.6 to 3.6 million years old. About 10 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 Aucilla reaches the Gulf of America by way of the Aucilla: about 45 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Aucilla; river miles along the main stem, rounded.
