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Geode State Park is a state park in Henry County, Iowa bordering Des Moines County. It is managed by the Iowa Department of Natural Resources. While it is named for Iowa's state rock, the geode, few can be found in the park. A display of geodes, with their mysterious crystal formations in their hollow cavities, can be seen at the park office.
The thunderegg, a nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow, were said by the Native Americans of Warm Springs to have been created by thunder spirits that lived in the craters of Mount Hood and Mount Jefferson. [83] [84]
Commemorates the site of a fort built to protect the Iowa border during the Dakota War of 1862. Geode State Park: Henry County: Danville: 1,641 664: Skunk River, Lake Geode: Features a 187-acre (76 ha) recreational reservoir and a display of geodes, the Iowa state rock. George Wyth Memorial State Park: Black Hawk County: Waterloo: 1,200 490: 1940
Geode from the Warsaw Formation (Warsaw, Hancock County, Illinois) Type: ... Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod.
The Jordan Aquifer is the largest source of groundwater, extending from northeast Iowa to south central Iowa, and is ultimately the source of much of Iowa's agricultural and industrial water. In addition to pollution threats, the aquifer is threatened by overuse in well-source irrigation, ethanol production, and the diminishment of resupply ...
Archeologists in Iowa believe they have unearthed an ancient mastodon skull dating back to when the first humans were roaming the Earth.. Discovered in the southern part of the state, the find is ...
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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.