The Halchita 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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Halchita’s center stands about 4,380 ft above sea level. Within three miles the land runs from 4,080 ft to 5,070 ft, a difference of 990 ft: steep hill country. The highest named summit within 15 miles is Brighams Tomb, about 6,660 ft, 12 miles west-southwest.
Under the town center the state geologic map shows Cutler Group (sandstone), from the Late Pennsylvanian to Permian, 273 to 307 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Late Pennsylvanian to Permian, 273 to 307 million years old. About 12 mi of the line.
Limestone. Age: Late Pennsylvanian to Permian, 295 to 307 million years old. About 7 mi of the line.
Sand. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Sandstone. Age: Late Triassic to Early Jurassic, 180 to 210 million years old. About 2 mi of the line.
Evaporite. Age: Late Mississippian to Late Pennsylvanian, 299 to 331 million years old. About 0.8 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 0.8 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 Halchita reaches the Gulf of California by way of the San Juan and the Colorado: about 960 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
290 miles of the trip are on the Colorado.
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 Halchita; river miles along the main stem, rounded.
