The Hayfork 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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Hayfork’s center stands about 2,330 ft above sea level. Within three miles the land runs from 2,270 ft to 3,880 ft, a difference of 1,610 ft: steep hill country. The highest named summit within 15 miles is Chanchelulla Peak, about 6,350 ft, 12 miles east-southeast.
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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Melange. Age: Devonian to Jurassic, 145 to 422 million years old. About 12 mi of the line.
Sandstone. Age: Oligocene to Miocene, 5.3 to 34 million years old. About 4 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Plutonic. Age: Late Triassic to Early Jurassic, 175 to 237 million years old. About 2 mi of the line.
Peridotite, serpentinite. Age: Neoproterozoic to Early Jurassic, 175 to 1,000 million years old. About 2 mi of the line.
Amphibolite, schist. Age: Devonian, 359 to 422 million years old. About 0.9 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 Hayfork reaches the Pacific Ocean by way of Hayfork Creek, the South Fork Trinity, the Trinity and the Klamath: about 130 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hayfork; river miles along the main stem, rounded.
