The Ada 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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Ada’s center stands about 1,020 ft above sea level. Within three miles the land runs from 870 ft to 1,080 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Chimney Hill, about 1,330 ft, 8 miles southwest.
Under the town center the state geologic map shows Ada Group or Ada Formation (shale, sandstone, limestone), from the Carboniferous, 299 to 324 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 38×. 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 4 mi of the line.
Shale, siltstone, sandstone. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Shale, sandstone, limestone. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Shale, sandstone, limestone. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Limestone, shale. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 3 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 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. 7 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 Ada reaches the Gulf of America by way of Clear Boggy Creek, Muddy Boggy Creek, the Red River, the Atchafalaya and the Lower Atchafalaya: about 870 river miles.
590 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ada; river miles along the main stem, rounded.
