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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.
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.
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.
The half of the state south of Little Rock is apter to see ice storms. Arkansas's record high is 120 °F (49 °C) at Ozark on August 10, 1936; the record low is −29 °F (−34 °C) at Gravette, on February 13, 1905. [16] Arkansas is known for extreme weather and frequent storms.
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.
The Ouachita Mountains (/ ˈ w ɒ ʃ ɪ t ɔː /), simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma.They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, one of the important orogenic belts of North America. [3]
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.
Geologic map for the Anadarko Basin showing thickness of strata between the Silurian Hunter Group and the Pennsylvanian Desmoinesian Anadarko Basin Geologic Cross Section. The Anadarko Basin is a geologic depositional and structural basin centered in the western part of the state of Oklahoma and the Texas Panhandle, and extending into southwestern Kansas and southeastern Colorado.