The Caddo 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.
Mostly cloudy
Showers likely; cooler
Chance of showers; warmer
Partly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
Caddo’s center stands about 730 ft above sea level. Within three miles the land runs from 620 ft to 750 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Caddo Formation (limestone, shale, marlstone), from the Early Cretaceous, 100 to 145 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 63×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, shale, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 12 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Claystone. Age: Early Cretaceous, 100 to 145 million years old. About 2 mi of the line.
Shale. Age: Early Cretaceous, 100 to 145 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.
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 Caddo reaches the Gulf of America by way of Caddo Creek, the Blue River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 790 river miles.
610 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Caddo; river miles along the main stem, rounded.
