Ecoregions of Oklahoma 103° 102° 101° 100° 99° 98° 97° 96° 95° 27 Medicine Lodge Independence 25 26 27 28 29 40 26 Winfield Joplin ° 25c 37 COLORADO Liberal A O 25b 25b r 25b k 37° IC 25c 26a an X 25b KANSAS sas N r R 26 E ve eo Ri 25b i s arron v h Picher M 26f Cim ma 25e Ci rron 26b 26a e o C r W R R iver h ive 39a E 25c 27d i r N k 39 a 40b Miami 25e 25b s k 27l i Boise City 25e Alva a 40d r R Rive 27p iv Bartlesville er 27q e 39b av r Kaw e 25c B Guymon 26a Ponca City Lake 28a 25b Optima Great Salt 25e S C Grand Lake O’ 25 Lake Plains Lake a a 25e lt F iver n The Cherokees 26a ork Arkansas R e 27q y 25e 25e 25e R 39a MISSOURI i TEXAS C v Oologah 27d e im 29a Lake ARKANSAS r 39a ar Woodward ron Perryton R Stratford N i ver 39a 25 25 25 o 27l Enid r 27n Lake 39 th Pawnee Pryor Hudson 39b 103° 102° 101° C 27l T Claremore a u n r Perry Keystone 40b a k d e Lake ia y . n R R C 39a 39a V o 25 High Plains 33 East Central Texas Plains iv r e e e Tulsa r h r Canton Lake e d s r k i o e 26 Stillwater g e iv 25b Rolling Sand Plains 33a Northern Post Oak Savanna ver r R i i n R N Fort Gibson is 27o arro s o im Broken Arrow R Lake 39a in i l 39a C l 39b ° v 36 25c Moderate Relief Plains 27l I ° e 35 South Central Plains 36 r Sapulpa 25e Canadian/Cimarron High Plains Cushing Tahlequah 35b Floodplains and Low Terraces 27l C Guthrie a 26 Southwestern Tablelands 35c Pleistocene Fluvial Terraces na 27l River S d r sas ian ive an 39a 26a Canadian/Cimarron Breaks A R Ark 35d Cretaceous Dissected Uplands 27q TEX Muskogee 38 26b Flat Tablelands and Valleys 35g Red River Bottomlands W a s 27d Okmulgee 40b 26c Caprock Canyons, Badlands, hi Tenkiller 35h Blackland Prairie ta Dee Ferry 38b R N p Fork iv o Lake er r and Breaks El Reno th 29a 27h Clinton C 37b Sallisaw 36 Ouachita Mountains Weatherford an 26f Mesa de Maya/Black Mesa ad ia 36a Athens Plateau 27 Ca Oklahoma City n Elk City nad R ian iv Fort 27 Central Great Plains River e 37b Smith 36b Central Mountain Ranges r Shawnee Robert S. N Kerr 27d Prairie Tableland o r Lake Reservoir 37a 36d Fourche Mountains th 27l F Norman Thunderbird r 27h Red Prairie o ive 36e Western Ouachitas rk R er 37d R Little iv e R Eufaula 37 27i Broken Red Plains d n Lake 37a 36f Western Ouachita Valleys R ia iv d e Chickasha a 37a r 27k Wichita Mountains r n Poteau e ° 26 a 37a i v 35 ° 27k 27o C R 37 Arkansas Valley 35 Elm Fo Lake u 27l Pleistocene Sand Dunes 26c rk Re Altus Ca ea d R 27h nadian R McAlester Pot 37a iver iver 27m Red River Tablelands 37a Scattered High Ridges 27k 27o ita R and Mountains Lake Wash iver 37e 27n Gypsum Hills S 27r a Ellsworth 36d l Ada 27 t 37b Arkansas River Floodplain F 27k Pauls Valley Sardis 27o Cross Timbers Transition o Mu 36f 36a r 27k dd Lake k y 36d 37d Arkansas Valley Plains R 27p Salt Plains B e o d 27m g 36e 37e Lower Canadian Hills 26 R Altus 29h g y 27q Rolling Red Hills i Lawton er 36f v v C i R e i R r h ed Duncan e ic 27r Limestone Hills e 38 Boston Mountains R m L 36 k Atoka a iver i i 36a 27h Reservoir 36e t K t l 28 Flint Hills 38b Lower Boston Mountains 29g e 29i R i 36e v Broken Waurika Lake e 28a Flint Hills 39 Ozark Highlands r Bow Clear Bo 36f Lake 29 Cross Timbers 36f Pine 39a Springfield Plateau 27i ggy Creek Creek 36b Ardmore B lu Lake 36a 29a Northern Cross Timbers 39b Dissected Springfield Plateau– e Hugo R 35d TEXAS 29c iv Lake e 29b Eastern Cross Timbers Elk River Hills r 29b Hugo 35c 34° 34° 29c Western Cross Timbers 27 Lake 35h Little River 35b 40 Central Irregular Plains Texoma Durant 35c Wichita Falls 35c 35b 35 29d Grand Prairie 29d Idabel 40b Osage Cuestas S 33a 35g R 35d Red River ed A 29g Arbuckle Uplift 35h S 35 R 35g iv N 40d Cherokee Plains Lake Pat Mayse er 26 Kemp TEXAS Lake 35c A 29h Northwestern Cross Timbers Lake 33 K Arrowhead R A 29i Arbuckle Mountains TEXAS 29 Sherman 33 32 ° ° ° ° ° INTERIOR—GEOLOGICAL SURVEY, RESTON, VIRGINIA—2005 100 99 98 97 96 95° Level III ecoregion boundary PRINCIPAL AUTHORS: Alan J. Woods (Oregon State University), James M. Omernik (U.S. Geological REVIEWERS: George A. Bukenhofer (U.S. Forest Service), Richard A. Marston (Boone Pickens School Survey), Daniel R. Butler (Oklahoma Conservation Commission–Water Quality Division), Jimmy G. of Geology, Oklahoma State University), David V. Peck (U.S. Environmental Protection Agency), and Level IV ecoregion boundary Ford (U.S. Department of Agriculture–Natural Resources Conservation Service), James E. Henley (U.S. Dale Splinter (Boone Pickens School of Geology, Oklahoma State University). Department of Agriculture–Natural Resources Conservation Service), Bruce W. Hoagland (Oklahoma State boundary Biological Survey), Derek S. Arndt (Oklahoma Climatological Survey), and Brian C. Moran (Indus CITING THIS POSTER: Woods, A.J., Omernik, J.M., Butler, D.R., Ford, J.G., Henley, J.E., Hoagland, Corporation). B.W., Arndt, D.S., and Moran, B.C., 2005, Ecoregions of Oklahoma (color poster with map, descriptive County boundary text, summary tables, and photographs): Reston, Virginia, U.S. Geological Survey (map scale COLLABORATORS AND CONTRIBUTORS: Kurt Atkinson (Oklahoma Department of Agriculture, 1:1,250,000). SCALE 1:3 125 000 Food, and Forestry), Sandy A. Bryce (Dynamac Corporation), Shannen S. Chapman (Dynamac Corporation), Philip A. Crocker (U.S. Environmental Protection Agency), Glenn E. Griffith (Dynamac This project was supported in part by funds from USEPA Region 6, Water Quality Cooperative 15 0 15 30 mi Corporation), Chris Hise (The Nature Conservancy), Charlie Howell (U.S. Environmental Protection Agreement under the provisions of Section 104(b) (3) of the Clean Water Act to the Oklahoma Water Agency), Ron Jarman (Apex Environmental, Inc.), Thomas R. Loveland (U.S. Geological Survey), Resources Board (through the Office of the Secretary of Environment, State of Oklahoma). Assistance 30 0 30 60 km Kenneth V. Luza (Oklahoma Geological Survey), Phillip Moershel (Oklahoma Water Resources Board), from the private sector is acknowledged in the form of Ron Jarman, Ph.D., on loan from Apex Mark E. Moseley (U.S. Department of Agriculture–Natural Resources Conservation Service), Randy Environmental, Inc. Albers Equal Area Projection Parham (Oklahoma Department of Environmental Quality), and Brooks Tramell (Oklahoma ° ° Standard Parallels 34 30' N and 36 00' N Conservation Commission–Water Quality Division). Electronic versions of ecoregion maps and posters as well as other ecoregion resources are available at http://www.epa.gov/wed/pages/ecoregions.htm .