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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. Geology of Arkansas - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Arkansas

    The geology of Arkansas includes deep 1.4 billion year old igneous crystalline basement rock from the Proterozoic known only from boreholes, overlain by extensive sedimentary rocks and some volcanic rocks. The region was a shallow marine, riverine and coastal environment for much of the early Paleozoic as multi-cellular life became commonplace.

  4. Ozan Formation - Wikipedia

    en.wikipedia.org/wiki/Ozan_Formation

    Arkansas, Oklahoma: Country: United States: Type section; Named by: C.H. Dane [2] The Ozan Formation is a geologic formation in Arkansas, Oklahoma [1] and Texas.

  5. Trinity Group (geologic group) - Wikipedia

    en.wikipedia.org/wiki/Trinity_Group_(geologic_group)

    The Trinity Group is a group (sequence of rock strata) in the Lower Cretaceous lithostratigraphy of Texas, Arkansas, Mississippi, Louisiana and Oklahoma. [2] [3] [4] It is named for the Trinity River of Texas. A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group.

  6. McAlester Formation - Wikipedia

    en.wikipedia.org/wiki/McAlester_Formation

    The McAlester Formation is a Pennsylvanian geologic formation in the Ouachita Mountains of Arkansas and Oklahoma.Early descriptions of this unit considered it to be part of the Coal Measures, [3] part of the Upper or Western Coal Bearing Division, [4] the Spadra Stage and part of the Sebastian Stage, [3] and part of the Cavaniol Group. [5]

  7. Cotter Formation - Wikipedia

    en.wikipedia.org/wiki/Cotter_Formation

    The Cotter Formation is a geologic formation in Arkansas, [2] Missouri, [3] Oklahoma [4] and in Virginia. It preserves fossils dating back to the Ordovician period . See also

  8. Geology of Oklahoma - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Oklahoma

    The geology of Oklahoma is characterized by Carboniferous rocks in the east, Permian rocks in the center and towards the west, and a cover of Tertiary deposits in the panhandle to the west. The panhandle of Oklahoma is also noted for its Jurassic rocks as well.

  9. Knox Supergroup - Wikipedia

    en.wikipedia.org/wiki/Knox_Supergroup

    Most likely the Arbuckle Arbuckle Group of Oklahoma, and Ellenburger Group of Texas are equlivant to the Beekmantown. [8] The usage of the term is diverse and depends on the state or region in question, and the group encompasses different formations in different regions. In some states it is considered a formation rather than a group, but the ...

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