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A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.
Chlorastrolite occurs as amygdaloid structures and fracture fillings in basalt, and when the water and wave action has worn away the basalt, they are found as beach pebbles and granules in loose sediments. It is found in the Keweenaw Peninsula of the Upper Peninsula of Michigan and Isle Royale in Lake Superior. Isle Royale is a National Park ...
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [80] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Images Chonetes: C. mediolatus [4] Also found in the Bell Shale, Ferron Point Formation and St. Laurent Limestone. Pentamerella: P. sp. B Basal 8 inches of the formation. [4] 2 specimens. [4] Pholidostrophia: P. gracilis gracilis [4] Also found in the Bell, Ferron Point and Genshaw formations. Schizophoria: S. ferronensis: Basal 8 inches of the ...
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Fossil shark spines found in Michigan are usually the remains of ctenacanths and cladodonts. Bradyodont shark teeth have also been discovered in Michigan, however, it's also possible that these teeth were shed by animals more closely related to holocephalans than true sharks. [6] Tabulate and tetra- corals disappeared from Michigan during the ...
St. Genevieve marble – Marble found in Missouri (not a "true marble"; oolitic limestone) St. Louis Limestone – Mississippian period geologic formation in the Midwest United States Tennessee marble – base material Pages displaying wikidata descriptions as a fallback (not a "true marble"; crystalline limestone)
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