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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.
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 ...
Ohio Sandstone: Berea Grit in Northeast Ohio, originally used for grindstones, later used to build the Federal Reserve Bank of New York [6] [7] Ohio bluestone, also found in Northeast Ohio in certain streambeds [8] [9] and used as dimension stone; Pennsylvania Bluestone in northeast Pennsylvania and adjoining parts of New Jersey and New York
In the 1960s, archaeologists digging at the site found caves with artifacts left by hunter-gatherers 12,000 years ago, during the last Ice Age. A Paleo-Indian fluted point, a very rare stone tool, was among them.[1] At the time of its discovery it was the oldest such site east of the Mississippi.[2]
This is a list of airports in Ohio (a U.S. state), grouped by type and sorted by location.It contains all public-use and military airports in the state. Some private-use and former airports may be included where notable, such as airports that were previously public-use, those with commercial enplanements recorded by the FAA or airports assigned an IATA airport code.
This is a list of airports in Michigan (a U.S. state), grouped by type and sorted by location.It contains all public-use and military airports in the state. Some private-use and former airports may be included where notable, such as airports that were previously public-use, those with commercial enplanements recorded by the FAA, or airports assigned an IATA airport code.
Blue rings found in the stems of trees and bushes in Norway point to a historic cold period in the late 1800s, but the exact cause of this climatic event remains unclear, scientists say.
The list of airports in the United States is broken down into separate lists due to the large number of airports. The lists include public-use and military airports in each U.S. state and territory .