The Sehili 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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Mostly sunny; warmer
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Chance of showers; cooler
Sehili’s center stands about 7,150 ft above sea level. Within three miles the land runs from 7,020 ft to 8,080 ft, a difference of 1,060 ft: steep hill country. The highest named summit within 15 miles is Roof Butte, about 9,790 ft, 13 miles north-northeast.
Under the town center the state geologic map shows Chinle Formation (mudstone), from the Late Triassic, 210 to 230 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 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.
Conglomerate, sandstone. Age: Late Triassic, 210 to 230 million years old. About 9 mi of the line.
Mudstone. Age: Late Triassic, 210 to 230 million years old. About 5 mi of the line.
Conglomerate, sandstone. Age: Early Paleocene to Early Oligocene, 30 to 65 million years old. About 4 mi of the line.
Sandstone. Age: Oligocene, 23 to 34 million years old. About 4 mi of the line.
Sandstone, shale, limestone. Age: Middle Pennsylvanian to Permian, 280 to 310 million years old. About 2 mi of the line.
Shale, limestone. Age: Late Cretaceous, 90 to 100 million years old. About 0.6 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 Sehili reaches the Gulf of California by way of Chinle Wash, Chinle Creek, the San Juan and the Colorado: about 1,140 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sehili; river miles along the main stem, rounded.
