The Takilma 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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Takilma’s center stands about 1,590 ft above sea level. Within three miles the land runs from 1,460 ft to 4,010 ft, a difference of 2,550 ft: mountain country. The highest named summit within 15 miles is Preston Peak, about 7,160 ft, 15 miles south.
Under the town center the state geologic map shows Alluvial deposits (sand, gravel, silt), from the Holocene, less than 12,000 years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Peridotite, serpentinite. Age: Paleozoic to Jurassic, 145 to 542 million years old. About 6 mi of the line.
Serpentinite. Age: Jurassic, 145 to 202 million years old. About 5 mi of the line.
Metaandesite, metabasalt, spilite. Age: Triassic to Jurassic, 145 to 252 million years old. About 5 mi of the line.
Gravel, boulders, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Sandstone, mudstone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Diorite. Age: Jurassic to Early Cretaceous, 100 to 202 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. 3 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 Takilma reaches the Pacific Ocean by way of the East Fork Illinois, the Illinois and the Rogue: about 95 river miles.
55 miles of the trip are on the Illinois.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Takilma; river miles along the main stem, rounded.
