The North Harlem Colony 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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North Harlem Colony’s center stands about 2,600 ft above sea level. Within three miles the land runs from 2,390 ft to 2,750 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is East Butte, about 3,300 ft, 11 miles north-northwest.
Under the town center the state geologic map shows Bearpaw Formation (shale), from the Late Cretaceous, 72 to 84 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 20×. 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. Age: Late Cretaceous, 72 to 84 million years old. About 13 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 72 to 84 million years old. About 5 mi of the line.
Gravel, sand, silt. Age: Pleistocene to Holocene, less than 1.8 million years old. About 4 mi of the line.
Sandstone, shale, bentonite. Age: Late Cretaceous, 66 to 84 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 North Harlem Colony reaches the Gulf of America by way of the Milk River, the Missouri and the Mississippi: about 3,250 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Sharpe and Lake Francis Case.
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 North Harlem Colony; river miles along the main stem, rounded.
