The Samnorwood 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.
Showers likely
Showers likely; cooler
Mostly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
Chance of showers
Samnorwood’s center stands about 2,190 ft above sea level. Within three miles the land runs from 2,080 ft to 2,320 ft, a difference of 240 ft: rolling country.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 29×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Permian, 252 to 299 million years old. About 11 mi of the line.
Sandstone-mudstone. Age: Permian, 252 to 299 million years old. About 9 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sand. Age: Late Miocene to Pliocene, 2.6 to 12 million years old. About 0.9 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 0.9 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 Samnorwood reaches the Gulf of America by way of Lake Creek, the Salt Fork Red, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,240 river miles.
980 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Samnorwood; river miles along the main stem, rounded.
