The Lake 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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Lake’s center stands about 740 ft above sea level. Within three miles the land runs from 680 ft to 820 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Chalk Hill, about 890 ft, 9 miles north-northwest.
Under the town center the state geologic map shows Munising Formation (sandstone), from the Cambrian, 487 to 497 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 61×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 5 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 5 mi of the line.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 4 mi of the line.
Granite, granodiorite. Age: Paleoproterozoic, 1.8 to 1.9 billion years old. About 3 mi of the line.
Limestone. Age: Late Ordovician, 445 to 459 million years old. About 3 mi of the line.
Granite, granodiorite. Age: Paleoproterozoic, 1.8 to 1.8 billion 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. 1 smaller unit 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 Lake reaches Lake Michigan by way of Longrie Creek, the Shakey and the Menominee: about 55 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake; river miles along the main stem, rounded.
