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  2. List of principal and guide meridians and base lines of the ...

    en.wikipedia.org/wiki/List_of_principal_and...

    Primarily from the United States Government Printing Office Style Manual. [1] State names usually signify only parts of each listed state, unless otherwise indicated. Based on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum.

  3. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    ^ Florida's state gem, moonstone, was adopted to highlight Florida's role in the United States' Lunar program, which landed the first astronauts on the Moon. [81] ^ Since 1983, Massachusetts has had 3 other official state rocks: State Historical Rock (Plymouth Rock), State Explorer Rock (Dighton Rock), and State Building and Monument Stone . In ...

  4. Plattin Limestone - Wikipedia

    en.wikipedia.org/wiki/Plattin_Limestone

    The Plattin Limestone is a Middle Ordovician geologic formation in Arkansas, Illinois, and Missouri. [1] The name was first introduced in 1904 by Edward Oscar Ulrich in his study of the geology of Missouri. [2] A type locality was designated at the mouth of the Plattin Creek in Jefferson County, Missouri, however a stratotype was not assigned ...

  5. Geology of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Illinois

    The earliest Carboniferous rocks sit conformably on top of the youngest Devonian in Illinois; Carboniferous rocks in the state are areally extensive, regionally very well-exposed, and form a large percentage of the state's bedrock. Illinois remained marine for much of the Carboniferous, with limestones making up most of the rock deposited ...

  6. Crater of Diamonds State Park - Wikipedia

    en.wikipedia.org/wiki/Crater_of_Diamonds_State_Park

    Crater of Diamonds State Park is a 911-acre (369 ha) Arkansas state park in Pike County, Arkansas, in the United States. The park features a 37.5-acre (15.2-hectare) plowed field, one of the few diamond -bearing sites accessible to the public.

  7. Arkansas Delta - Wikipedia

    en.wikipedia.org/wiki/Arkansas_Delta

    The Arkansas Delta is one of the six natural regions of the state of Arkansas. Willard B. Gatewood Jr., author of The Arkansas Delta: Land of Paradox , says that rich cotton lands of the Arkansas Delta make that area "The Deepest of the Deep South."

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  9. Mineral, Illinois - Wikipedia

    en.wikipedia.org/wiki/Mineral,_Illinois

    The Mineral School building continued to serve as a grade school for the Annawan School District until 1974, when its services as a school were ceased for good. The creation of I-80 north of Mineral was the second devastating blow to the growth of Mineral in the 1960s. All foreign traffic that previously traveled through town by the hundreds of ...

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