The Neylandville 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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Neylandville’s center stands about 540 ft above sea level. Within three miles the land runs from 500 ft to 620 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Neylandville Marl (claystone), from the Late Cretaceous, 66 to 72 million years old.
The section below crosses 9 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.
Clay, sand. Age: Paleocene, 56 to 66 million years old. About 6 mi of the line.
Clay. Age: Late Cretaceous, 66 to 72 million years old. About 5 mi of the line.
Clay, sand. Age: Late Cretaceous, 66 to 72 million years old. About 5 mi of the line.
Claystone. Age: Late Cretaceous, 66 to 72 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Claystone. Age: Late Cretaceous, 66 to 72 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. 3 smaller units 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 Neylandville reaches the Gulf of America by way of the South Sulphur, the Sulphur, the Red River, the Atchafalaya and the Lower Atchafalaya: about 700 river miles.
Lake on the way: Wright Patman Lake.
320 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Neylandville; river miles along the main stem, rounded.
