The Avon Volcanic District – Missouri’s Hidden Explosion Pipes
The Avon Volcanic District – Missouri’s Hidden Explosion Pipes In the rolling hills of southeastern Missouri, a short drive south of St. Louis, more than eighty small explosion pipes and dikes cut through ancient sedimentary rocks. These are the Avon Volcanic District (also called the Avon Magmatic District), a little-known suite of Devonian-age ultramafic diatremes…
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