The Plain Dealing 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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Plain Dealing’s center stands about 270 ft above sea level. Within three miles the land runs from 250 ft to 470 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Delaney Mount, about 480 ft, 3 miles west-northwest.
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 61×. 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, marl. Age: Eocene, 34 to 56 million years old. About 9 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 years old. About 7 mi of the line.
Clay, silt. Age: Pleistocene, less than 2.6 million years old. About 4 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sand, clay. Age: Eocene, 34 to 56 million years old. About 2 mi of the line.
Sand, clay. Age: Middle Eocene, 38 to 48 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 Plain Dealing reaches the Gulf of America by way of Little Cypress Bayou, Cypress Bayou, Red Chute Bayou, Loggy Bayou, the Red River, the Atchafalaya and the Lower Atchafalaya: about 440 river miles.
Lake on the way: Cypress Bayou Reservoir.
230 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Plain Dealing; river miles along the main stem, rounded.
