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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 ...
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.
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 ...
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 ...
The Moccasin Bluff site (also designated 20BE8) is an archaeological site located along the Red Bud Trail and the St. Joseph River north of Buchanan, Michigan.It was listed on the National Register of Historic Places in 1977, [1] and has been classified as a multi-component prehistoric site with the major component dating to the Late Woodland/Upper Mississippian period.
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The darker blue color resulted in limestone from this region being dubbed "bluestone" and with two sequences measuring about 10,000 feet (3,000 m) thick, it gives the area one of the largest limestone deposits in the world. [20] The stone eventually fades from a deep blue to a light grey after prolonged exposure to sun and rain.
Sanilac Petroglyphs Historic State Park is a historic preservation area in the U.S. state of Michigan. The state park, also known as ezhibiigadek asin (Ojibwe for "written on stone"), [3] consists of 240 acres (97 ha) in Greenleaf Township, Sanilac County, in Michigan's Thumb. It contains the largest collection of Native American petroglyphs in