The Ogema 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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Ogema’s center stands about 1,580 ft above sea level. Within three miles the land runs from 1,470 ft to 1,690 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Timms Hill, about 1,990 ft, 5 miles east.
Under the town center the state geologic map shows Mafic to felsic metavolcanic rocks, from the Paleoproterozoic, 1.6 to 2.5 billion years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 33×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metavolcanic. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 19 mi of the line.
Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 4 mi of the line.
Granite, tonalite, gneiss. Age: Paleoproterozoic, 1.8 to 1.9 billion 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.
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 Ogema reaches the Gulf of America by way of Holmes Creek, the South Fork Jump, the Jump, the Chippewa and the Mississippi: about 1,920 river miles.
Lakes on the way: Lake Wissota and Holcombe Flowage.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ogema; river miles along the main stem, rounded.
