Geological age ~1.47 billion years ago (granite intrusion).
Epoch Proterozoic eon; Rhyacian period; Graniteville Granite pluton emplaced during Midcontinent Rift precursor activity; spheroidal weathering forms developed over millions of subsequent years.
Native lands Osage Nation (Wazhazhe) · earlier Archaic and Woodland period peoples; Osage ancestral domain included all of southern Missouri; forced removal 1825.
Displacement & Tenure Cession 67: Treaty with the Osage (1808); Iron County granite quarried commercially from 1869 under the Iron Mountain and Southern Railroad and successors, producing Missouri Red paving granite for the Eads Bridge piers and St. Louis streets; Dr. John Stafford Brown purchased the site and deeded 134 acres to the Missouri Department of Natural Resources in 1966, with a deed clause prohibiting commercial granite extraction for 99 years; the park opened in 1970.
Shadow History The Graniteville quarry operated beginning in 1869 as a company town with approximately 700 residents at peak; the company owned the hotel, post office, store, railroad depot, and workers' homes; the quarry supplied paving granite for the Eads Bridge piers and St. Louis streets; silica dust exposure in granite quarrying was a nationally documented occupational hazard by the 1890s, producing silicosis in quarry workers, though no site-specific injury or fatality records for Graniteville appear in accessible public records; two abandoned quarry pits remain within the park without documented environmental remediation.
Ecology Igneous glade and savanna; rare lichen communities on granite surfaces; St. Francois Mountains endemic flora.
Hydrology Headwaters of Stout Creek; ephemeral drainage between boulder fields.
Acreage 132 acres
GPS 37.6370° N, 90.7260° W
Elephant Rocks State Park I · 2026-01-05
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Public Lands Institute — ongoing project
CC0 Public Domain
