Dugway Geode Half - Utah (with stand) Mammoth / Mastodon inside an underground limestone mine

inside an underground limestone mine sometime between 1770 and 1774

low and heavy heads

Because Halite is water soluble

(from the Greek word meaning "tree") are actually a mineral (>Manganese-oxide and iron-hydroxide) formation that occurs when mineral (manganese and iron) rich water finds its way between limestone and other rock layers then deposits those minerals along fissures inside the stone

Current scientific opinion is that all of the material came from the same impact

Dugway Geode Half - Utah (with stand) Mammoth / Mastodon inside an underground limestone mineWhen volcanic activity occurred in what is now western Utah some 8 million years ago, deposits of the igneous rock rhyolite formed. As the rock cooled, pockets of volcanic gases became trapped and formed cavities. The circulation of groundwater allowed silica and other minerals to precipitate into these cavities and form layers of agate and crystal quartz over the course of millions of years. Today the result is a beautiful and unique variety of