The Marble Hill 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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Marble Hill’s center stands about 490 ft above sea level. Within three miles the land runs from 390 ft to 720 ft, a difference of 330 ft: rolling country. The highest named summit within 15 miles is Big Rock, about 810 ft, 12 miles west.
Under the town center the state geologic map shows Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (dolostone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 34×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 13 mi of the line.
Sandstone, chert. Age: Early Ordovician, 471 to 487 million years old. About 7 mi of the line.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 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.
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 Marble Hill reaches the Gulf of America by way of Crooked Creek, the Castor River Diversion Channel and the Mississippi: about 1,060 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Marble Hill; river miles along the main stem, rounded.
