The Runge 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.
Runge’s center stands about 330 ft above sea level. Within three miles the land runs from 210 ft to 400 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Oakville Sandstone (sandstone, clay), from the Miocene, 5.3 to 23 million years old.
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 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.
Sandstone, clay. Age: Miocene, 5.3 to 23 million years old. About 15 mi of the line.
Clay, sandstone. Age: Miocene, 5.3 to 23 million years old. About 4 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 1 mi of the line.
Mudstone, sand. Age: Oligocene, 23 to 34 million years old. About 0.6 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 Runge reaches the Gulf of America by way of the San Antonio, the Guadalupe and the South Guadalupe: about 130 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Runge; river miles along the main stem, rounded.