The 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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73° on Nov. 15, 1999, the hottest reading for this week of the year since 1948. Next is 69° in 1973.
Marion’s center stands about 6,470 ft above sea level. Within three miles the land runs from 6,290 ft to 8,820 ft, a difference of 2,530 ft: mountain country. The highest named summit within 15 miles is Holiday, about 10,380 ft, 13 miles east-northeast.
Under the town center the state geologic map shows Alluvium and colluvium (unconsolidated), from the Quaternary, less than 2.6 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Andesite. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 7 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 6 mi of the line.
Arenite. Age: Mesoproterozoic to Neoproterozoic, 542 to 1,600 million years old. About 4 mi of the line.
Unconsolidated. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Shale. Age: Middle Mississippian to Late Mississippian, 324 to 347 million years old. About 1 mi of the line.
Limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 6 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 Marion reaches Great Salt Lake by way of Beaver Creek and the Weber: about 100 river miles. Great Salt Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Marion; river miles along the main stem, rounded.
Marion has a warm-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 15° in January. A normal year brings about 97 inches of snow; with the rain, that comes to about 17 inches of water.
On November 14 Marion normally reaches 45° and falls to 23°. The record high is 68°, in 1999; the record low 2°, in 1982. The most rain on this date, 0.98 in, fell in 2006.
Normals 1991–2020 and records since 1948 at Kamas, 3 miles south. NOAA, through RCC-ACIS.
