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The area is sometimes called the Lower Plains, North Central Plains,or Rolling Plains. [2] The Osage Plains, covering west-central Missouri , the southeastern third of Kansas , most of central Oklahoma , and extending into north-central Texas , is the southernmost of three tallgrass prairie physiographic areas.
The Springfield Plateau is the only Ozark Highland Level IV ecoregion within all four states. [1] The nearly level to rolling Springfield Plateau is underlain by cherty limestone of the Mississippian Boone Formation and Burlington Limestone; it is less rugged and wooded than Ecoregions 38, 39b, and 39c, and lacks the Ordovician dolomite and limestone of Ecoregions 39c and 39d.
The physiographic regions of the contiguous United States comprise 8 divisions, 25 provinces, and 85 sections. [1] The system dates to Nevin Fenneman's report Physiographic Divisions of the United States, published in 1916. [2] [3] The map was updated and republished by the Association of American Geographers in 1928. [4]
The Dissected Till Plains portion of the northern plains region lies in the portion of the state north of the Missouri River, while the Osage plains portion extends into the southwestern portion of the state bordering the Ozark Plateau. Thus the northern plains covers an area slightly more than a third of the state.
The Osage Hills is a hilly area in Oklahoma, commonly known as The Osage. The name refers to the broad rolling hills and rolling tallgrass prairie and Cross Timbers encompassing Osage County and surrounding areas, including portions of Mayes, Tulsa, Washington and Kay Counties. The Osage is the southern extension of the Flint Hills of Kansas.
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The Bakken Shale - a vast formation underlying parts of North Dakota, Montana, and South Dakota - has taken the U.S. by storm. Counties in North Dakota that were previously as quiet as a graveyard ...
The Cross Timbers are defined by the United States Environmental Protection Agency as Ecoregion 29, a Level III ecoregion. Some organizations and maps refer to the Cross Timbers ecoregion as the Central Oklahoma/Texas Plains. [4] The Cross Timbers are contained within the WWF central forest-grasslands transition ecoregion.