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Jan 2, 2020 · The general landscape of Southern Missouri was shaped by large volcanic calderas (volcanoes that erupt from many different vents). These volcanoes erupted molten ash that …

The St. Francois Mountains in southeast Missouri are a mountain range of Precambrian igneous mountains rising over the Ozark Plateau. This range is one of the oldest exposures of igneous …

Find list of active and inactive volcanoes in Missouri, United States its elevation, geo-coordinates, location map, when they last erupted and related info.

Aug 10, 2025 · Rocky Falls, Winona: Experience a piece of Missouri’s turbulent geologic past when molten rock deep within the earth flowed up to the surface, forming dense layers of …

Feb 13, 2012 · "The St. Francois Mountains is a region of formerly extensive volcanic terrane comprising several calderas, cauldron subsidence structures, ring intrusions, and resurgent …

Jul 14, 2022 · The St. Francois Mountains is a region of formerly extensive volcanic terrane comprising several calderas, cauldron subsidence structures, ring intrusions, and resurgent …

Oct 14, 2020 · Rhyolite is an igneous, volcanic rock composed chiefly of quartz and feldspar. Rhyolite formed when lava and volcanic ash erupted from ancient volcanoes and cooled very …

Younger igneous rocks formed from magma in the south between 1.5 and 1.4 billion years ago. In places, magma intruded preexisting basement rock and then erupted at the surface as …

Were there volcanoes in the Missouri Ozarks? How old are the igneous rocks there? Where can you go to explore the Precambrian backstory of the region's scenic St. Francois Mts?