The Iredell 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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Iredell’s center stands about 900 ft above sea level. Within three miles the land runs from 850 ft to 1,080 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Lone Mountain, about 1,400 ft, 15 miles north-northwest.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 44×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, shale. Age: Early Cretaceous, 100 to 145 million years old. About 11 mi of the line.
Claystone. Age: Early Cretaceous, 100 to 145 million years old. About 6 mi of the line.
Sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 5 mi of the line.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 0.9 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.6 mi of the line.
Clay. Age: Early Cretaceous, 100 to 145 million years old. About 0.4 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Iredell reaches the Gulf of America by way of the North Bosque, the South Bosque and the Brazos: about 490 river miles.
Lake on the way: Waco Lake.
410 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Iredell; river miles along the main stem, rounded.
