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The type locality is the Mazon River (or Mazon Creek), a tributary of the Illinois River near Morris, Grundy County, Illinois. The 25 to 30 meters of shale were formed approximately , during the Pennsylvanian period. The fossiliferous concretions are usually found within the thickest deposits of the Francis Creek Shale.
A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.
A six-foot-tall purple amethyst geode from Brazil is the largest geode on display. [6] Another exhibit features more than two dozen pairs of colorful quartz and calcite geodes from Mexico. An unusual mineralology exhibit presents three dozen fluorescent minerals, such as fluorite, opal, willemite, calcite, ruby and sodalite.
Geodes are found in southeast Iowa and are the official state rock. They consist of grey to pink cobbles within limestone that when cut or smashed open reveal a hollow crystal-filled interior. Geodes are common around Geode State Park in Henry County. [18]
A rare collection of ancient coins was discovered last week by Israeli researchers, who called the find an "archaeological Hanukkah miracle." The coins are more than 2,000 years old and believed ...
Two early Paleocene lava flows cap North Table Mountain. North Table Mountain is underlain by sedimentary rocks of the Denver Formation, which spans the interval from latest Cretaceous to early Paleocene time.
The restaurant opened on October 8, 1990, in Shenzhen's special economic zone. The South China Morning Post reported that on its opening day, the unique McDonald's received over 40,000 customers ...
The Pulpí Geode (Spanish: Geoda de Pulpí) is a giant geode found in the Mina Rica mine in Spain near the town of Pulpí (Province of Almería) on December 31st, 1999, [1] [2] by Adrian and Efren Cuesta, two young and intrepid mineralogists from Cantabria. This geode is one of the largest documented geodes in the world to date.