The Dennis 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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Dennis’s center stands about 600 ft above sea level. Within three miles the land runs from 430 ft to 650 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Freedom Hills, about 780 ft, 9 miles east-southeast.
Under the town center the state geologic map shows Eutaw formation (sand, clay), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 45×. 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: Late Cretaceous, 66 to 100 million years old. About 15 mi of the line.
Sand, clay. Age: Cretaceous, 66 to 145 million years old. About 5 mi of the line.
Sand, clay. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 1 mi of the line.
Sandstone. Age: Carboniferous, 324 to 359 million years old. About 0.8 mi of the line.
Sandstone, shale, limestone. Age: Carboniferous, 324 to 359 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Dennis reaches Mobile Bay and the Gulf of America by way of Jourdan Creek, Rock Creek, Mackeys Creek, the Tombigbee and the Mobile: about 480 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dennis; river miles along the main stem, rounded.
