The Lake Kerr 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 Kerr’s center stands about 50 ft above sea level. Within three miles the land runs from 20 ft to 170 ft, a difference of 150 ft: gently rolling country.
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 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.
Sand, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Sand. Age: Late Pliocene, 2.6 to 3.6 million years old. About 5 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Sand, clay. Age: Middle Miocene to Late Miocene, 5.3 to 16 million years old. About 4 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 Lake Kerr reaches the St. Johns River and the Atlantic Ocean by way of Salt Springs Run and Trout Creek: about 120 river miles.
Lake on the way: George, Lake.
100 miles of the trip are on Trout Creek.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Kerr; river miles along the main stem, rounded.
