The Point Marion 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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79° on Nov. 16, 1987, the hottest reading for this week of the year since 1951. Next is 79° in 2020.
Point Marion’s center stands about 830 ft above sea level. Within three miles the land runs from 780 ft to 1,300 ft, a difference of 520 ft: hilly country. The highest named summit within 15 miles is Devies Mountain, about 2,780 ft, 9 miles east.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, clastic. Age: Carboniferous, 299 to 324 million years old. About 5 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous to Permian, 252 to 324 million years old. About 5 mi of the line.
Limestone, shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 4 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Sandstone. Age: Carboniferous, 324 to 359 million years old. About 2 mi of the line.
Shale. Age: Carboniferous, 299 to 324 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. 4 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 Point Marion reaches the Gulf of America by way of Camp Run, the Monongahela, the Ohio and the Mississippi: about 2,040 river miles.
970 miles of the trip are on the Ohio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Point Marion; river miles along the main stem, rounded.
Point Marion has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 21° in January. About 45 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1951 at Point Marion Lock 8, here. NOAA, through RCC-ACIS.
