The Plum 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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Plum’s center stands about 300 ft above sea level. Within three miles the land runs from 250 ft to 390 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Hellers Hill, about 560 ft, 12 miles east-northeast.
Under the town center the state geologic map shows Manning Formation (sandstone-mudstone), from the Late Eocene, 34 to 38 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 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.
Claystone, sandstone. Age: Eocene, 34 to 56 million years old. About 7 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Claystone, sandstone. Age: Eocene, 34 to 56 million years old. About 4 mi of the line.
Sandstone, clay. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Sandstone-mudstone. Age: Late Eocene, 34 to 38 million years old. About 2 mi of the line.
Mudstone, sand. Age: Oligocene, 23 to 34 million 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. 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 Plum reaches the Gulf of America by way of the Colorado: about 190 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Plum; river miles along the main stem, rounded.
