The Ryan 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.
Chance of showers
Showers likely; cooler
Chance of showers; warmer
Sunny
Mostly cloudy
Chance of showers
Partly cloudy
Ryan’s center stands about 910 ft above sea level. Within three miles the land runs from 810 ft to 930 ft, a difference of 120 ft: gently rolling country.
The section below crosses 4 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.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 11 mi of the line.
Shale, sandstone, conglomerate. Age: Permian, 252 to 299 million years old. About 6 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Shale, sandstone, limestone. Age: Carboniferous, 299 to 324 million years old. About 2 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 Ryan reaches the Gulf of America by way of Beaver Creek, the Red River, the Atchafalaya and the Lower Atchafalaya: about 980 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ryan; river miles along the main stem, rounded.
