The Bratton 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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Bratton’s center stands about 1,600 ft above sea level. Within three miles the land runs from 480 ft to 1,870 ft, a difference of 1,390 ft: steep hill country. The highest named summit within 15 miles is Broad Mountain, about 2,400 ft, 14 miles north-northwest.
Under the town center the state geologic map shows Juniata Formation (sandstone, shale), from the Ordovician, 445 to 487 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. 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, sandstone. Age: Silurian, 422 to 445 million years old. About 6 mi of the line.
Sandstone, shale. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 2 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Black-shale. Age: Early Devonian to Middle Devonian, 384 to 422 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. 7 smaller units 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 Bratton reaches Chesapeake Bay and the Atlantic Ocean by way of Carlisle Run, the Juniata and the Susquehanna: about 150 river miles.
Lake on the way: Lake Aldred.
60 miles of the trip are on the Juniata.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bratton; river miles along the main stem, rounded.
