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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.
The preservation of fossils in Michigan resumed when the last glaciers withdrew from the state. Between 17,000 and 13,000 years ago, much of Michigan's icy covering had disappeared. After the glaciers melted much of the state was covered in large lakes made of glacial meltwater. By 10,000 years ago many of these lakes had dried.
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 ...
Researchers discovered a 500-year-old compass in a hidden chamber in Frombork, Poland, possibly used by Copernicus, shedding light on his astronomical work.
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An active search is underway for a 66-year-old Michigan woman who disappeared from a popular tourist hot spot during a trip to the Grand Canyon more than a week ago, officials said.
The Michigan Condensed Milk Factory (owned by the Borden family) was constructed in 1908 and used as a creamery until 1960. After laying vacant for 40 years, it was refurbished in 2003–2009, and now houses the offices of the City of Mount Pleasant. 3: Mount Pleasant Downtown Historic District: Mount Pleasant Downtown Historic District