The Calvert 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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Calvert’s center stands about 60 ft above sea level. Within three miles the land runs from 20 ft to 190 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Dwight Hill, about 340 ft, 14 miles west.
Under the town center the state geologic map shows Alluvial, coastal and low terrace deposits (sand), from the Holocene, less than 12,000 years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 56×. 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. Age: Holocene, less than 12,000 years old. About 14 mi of the line.
Sand, clay. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 9 mi of the line.
Sand. Age: Pliocene to Pleistocene, less than 5.3 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.
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 Calvert reaches Mobile Bay and the Gulf of America by way of Poll Bayou, the Tombigbee and the Mobile: about 65 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Calvert; river miles along the main stem, rounded.
