The Crosby 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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Crosby’s center stands about 920 ft above sea level. Within three miles the land runs from 850 ft to 1,000 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Minong volcanic sequence, from the Mesoproterozoic, 1 to 1.2 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 11 mi of the line.
Mafic-volcanic. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 10 mi of the line.
Volcanic. Age: Mesoproterozoic, 1 to 1.2 billion years old. About 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 Crosby reaches the Gulf of America by way of Sand Creek, the Saint Croix and the Mississippi: about 1,900 river miles.
Lakes on the way: Lake Pepin and Lake Mallalieu 175.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Crosby; river miles along the main stem, rounded.
