The Summerhaven 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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Summerhaven’s center stands about 7,730 ft above sea level. Within three miles the land runs from 5,250 ft to 8,930 ft, a difference of 3,680 ft: mountain country. The highest named summit within 15 miles is Mount Lemmon, about 9,150 ft, 2 miles west.
Under the town center the state geologic map shows Middle Proterozoic granitic rocks (granite), from the Mesoproterozoic, 1.4 to 1.4 billion 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 3×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Late Cretaceous to Early Eocene, 50 to 80 million years old. About 7 mi of the line.
Granite. Age: Mesoproterozoic, 1.4 to 1.4 billion years old. About 6 mi of the line.
Conglomerate, sandstone. Age: Early Miocene to Pleistocene, 2 to 16 million years old. About 6 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, sandstone, quartzite. Age: Mesoproterozoic to Neoproterozoic, 700 to 1,300 million years old. About 2 mi of the line.
Gravel, sand. Age: Late Pliocene to Pleistocene, 0.8 to 3 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.
