The Denison 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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85° on Nov. 13, 1999, the hottest reading for this week of the year since 1902. Next is 81° in 1914.
Denison’s center stands about 1,060 ft above sea level. Within three miles the land runs from 980 ft to 1,150 ft, a difference of 170 ft: gently rolling country.
Under the town center the state geologic map shows Wabaunsee Group (shale), from the Carboniferous, 299 to 324 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 52×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, silt. Age: Pleistocene, less than 2.6 million years old. About 15 mi of the line.
Shale. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Limestone, shale. Age: Carboniferous, 299 to 324 million years old. About 1 mi of the line.
Shale. Age: Carboniferous, 299 to 324 million years old. About 0.7 mi of the line.
Limestone, shale. Age: Permian, 252 to 299 million years old. About 0.3 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 Denison reaches the Gulf of America by way of North Cedar Creek, Cedar Creek, the Delaware, the Kansas, the Missouri and the Mississippi: about 1,640 river miles.
Lake on the way: Perry Lake.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Denison; river miles along the main stem, rounded.
Denison has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 15° in January. About 37 inches of rain fall in a normal year.
On November 14 Denison normally reaches 54° and falls to 30°. The record high is 77°, in 1964; the record low 5°, in 1959. The most rain on this date, 0.87 in, fell in 1972.
Normals 1991–2020 and records since 1902 at Holton, 8 miles west-northwest. NOAA, through RCC-ACIS.
