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| | Summary of Citation (Site not responding. Last check: 2007-10-20) |
 | | Publication: Sides, J.R., Bickford, M.E., Shuster, R.D. and Nusbaum, R.L., 1981, Calderas in the Precambrian terrane of the St. Francois Mountains, southeastern Missouri, IN Granites and rhyolites: Journal of Geophysical Research, B, Solid Earth and Planets, v. |
 | | Most volcanic rocks of St. Francois Mountains are 1485 m.y. |
 | | Revised in that Iron Mountain Lake overlies (though contact relations are poorly defined) Wolf Mountain Ignimbrite (first used) in central St. Francois Mountains, southeast MO, Midcontinent region. |
| ngmdb.usgs.gov /Geolex/Refsmry/sumry_8947.html (163 words) |
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