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 350 ft above sea level. Within three miles the land runs from 280 ft to 400 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Long Mountain, about 500 ft, 12 miles south-southwest.
Under the town center the state geologic map shows Calvert Bluff Formation (claystone), from the Late Paleocene to Early Eocene, 48 to 59 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 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.
Claystone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 7 mi of the line.
Mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 6 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 4 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 1 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 Calvert reaches the Gulf of America by way of Tidwell Creek, Sandy Creek, Mud Creek and the Brazos: about 330 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.
