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Select by stratigraphic unit: QUATERNARY  SYSTEM     Holocene Series  Series         DeForest  Formation             Camp Creek  Member             Roberts Creek  Member             Gunder  Member             Corrington  Member             Flack  Member             Woden  Member             West Okoboji  Member     Pleistocene Series  Series      Wisconsinan Episode          Peoria  Formation         Dows  Formation             Pilot Knob  Member             Lake Mills  Member             Morgan  Member             Alden  Member         Noah Creek  Formation         Sheldon Creek  Formation         Roxana/Pisgah  Formation      Illinoian Episode          Loveland  Formation         Glasford  Formation             Kellerville  Member      Pre-Illinoian          Wolf Creek  Formation             Hickory Hills  Member             Aurora  Member             Winthrop  Member         Alburnett  Formation         A glacial tills  Formation         B glacial tills  Formation         C glacial tills  Formation TERTIARY  SYSTEM         Salt & Pepper sands  Formation CRETACEOUS  SYSTEM     "Manson"  Group     "upper Colorado"  Group         Niobrara  Formation     Fort Benton ("lower Colorado ")  Group         Carlile Shale  Formation         Greenhorn Limestone  Formation         Graneros Shale  Formation         Dakota  Formation             Woodbury  Member             Nishnabotna  Member         Windrow  Formation             Ostrander  Member             Iron Hill  Member JURASSIC  SYSTEM         Fort Dodge  Formation PENNSYLVANIAN (subsystem of Carboniferous System)  SYSTEM     Wabaunsee  Group         Wood Siding  Formation         Root  Formation             French Creek Shale  Member             Jim Creek Limestone  Member             Friedrich Shale  Member         Stotler  Formation             Grandhaven Limestone  Member             Dry Shale  Member             Dover Limestone  Member         Pillsbury  Formation             Nyman Coal  Member         Zeandale  Formation             Maple Hill Limestone  Member             Wamego Shale  Member             Tarkio Limestone  Member         Willard Shale  Formation         Emporia  Formation             Elmont Limestone  Member             Harveyville Shale  Member             Reading Limestone  Member         Auburn Shale  Formation         Bern  Formation             Wakarusa Limestone  Member             Soldier Creek Shale  Member             Burlingame Limestone  Member         Scranton  Formation             Silver Lake Shale  Member             Rulo Limestone  Member             Cedar Vale Shale  Member             Elmo Coal  Member             Happy Hollow Limestone  Member             White Cloud Shale  Member         Howard Limestone  Formation             Utopia Limestone  Member             Winzeler Shale  Member             Church Limestone  Member             Aarde Shale  Member             Nodaway Coal  Member         Severy Shale  Formation     Shawnee  Group         Topeka  Formation             Coal Creek Limestone  Member             Holt Shale  Member             DuBois Limestone  Member             Turner Creek Shale  Member             Sheldon Limestone  Member             Jones Point Shale  Member             Curzon Limestone  Member             Iowa Point Shale  Member             Hartford Limestone  Member         Calhoun Shale  Formation         Deer Creek  Formation             Ervine Creek Limestone  Member             Burroak Shale  Member             Haynies Limestone  Member             Larsh Shale  Member             Rock Bluff Limestone  Member             Oskaloosa Shale  Member             Ozawkie Limestone  Member         Tecumseh Shale  Formation         Lecompton  Formation             Avoca Limestone  Member             King Hill Shale  Member             Beil Limestone  Member             Queen Hill Shale  Member             Big Spring Limestone  Member             Doniphan Shale  Member             Spring Branch Limestone  Member         Kanwaka Shale  Formation         Oread  Formation             Kereford Limestone  Member             Heumader Shale  Member             Plattsmouth Limestone  Member             Heebner Shale  Member             Leavenworth Limestone  Member             Snyderville Shale  Member             Toronto Limestone  Member     Douglas  Group         Lawrence  Formation         Cass Limestone  Formation             Shoemaker Limestone  Member             Little Pawnee Shale  Member             Haskell Limestone  Member         Stranger  Formation             Iatan Limestone  Member             Weston Shale  Member     Lansing  Group         South Bend Limestone  Formation             Kitaki Limestone  Member             Gretna Shale  Member             Little Kaw Limestone  Member         Rock Lake Shale  Formation         Stanton  Formation             Stoner Limestone  Member             Eudora Shale  Member             Captain Creek Limestone  Member         Vilas Shale  Formation         Plattsburg  Formation             Spring Hill Limestone  Member             Hickory Creek Shale  Member             Merriam Limestone  Member     Kansas City  Group         Lane Shale  Formation         Wyandotte  Formation             Argentine Limestone  Member             Quindaro Shale  Member         Liberty Memorial Shale  Formation         Iola  Formation             Raytown Limestone  Member             Muncie Creek Shale  Member             Paola Limestone  Member         Chanute Shale  Formation         Dewey  Formation             Cement City Limestone  Member             Quivira Shale  Member         Nellie Bly Shale  Formation         Cherryvale  Formation             Westerville Limestone  Member             Wea Shale  Member             Block Limestone  Member             Fontana Shale  Member     Bronson  Group         Dennis  Formation             Winterset Limestone  Member             Stark Shale  Member             Canville Limestone  Member         Galesburg Shale  Formation         Swope  Formation             Bethany Falls Limestone  Member             Hushpuckney Shale  Member             Middle Creek Limestone  Member         Elm Branch Shale  Formation         Hertha  Formation             Sniabar Limestone  Member             Mound City Shale  Member             East Peru Limestone  Member         Pleasanton  Formation             Manly-Guthrie Mountain Shale  Member             Exline Limestone  Member         Hepler Shale  Formation             Green Valley Coal  Member     Marmaton  Group         Lost Branch  Formation             Cooper Creek Limestone  Member             Nuyaka Creek Shale  Member             Sni Mills Limestone  Member         Memorial Shale  Formation         Lenapah  Formation         Nowata Shale  Formation         Altamont  Formation             Worland Limestone  Member             Lake Neosho Shale  Member             Amoret Limestone  Member         Bandera Shale  Formation         Pawnee  Formation             Coal City Limestone  Member             Mine Creek Shale  Member             Myrick Station Limestone  Member             Anna Shale  Member         Labette  Formation             Mystic Coal  Member             Marshall Coal  Member         Stephens Forest  Formation             Higginsville Limestone  Member             Blackwater Creek Shale  Member             Houx Limestone  Member             Little Osage Shale  Member         Morgan School Shale  Formation             Summit Coal  Member         Mouse Creek  Formation             Blackjack Creek Limestone  Member             Excello Shale  Member     Cherokee  Group         Swede Hollow  Formation             Mulky Coal  Member             Bevier Coal  Member             Wheeler Coal  Member             Ardmore Limestone  Member             Oakley Shale  Member             Whitebreast Coal  Member         Floris  Formation             Carruthers Coal  Member             Laddsdale Coal  Member         Spoon  Formation         Kalo  Formation             Cliffland Coal  Member             Blackoak Coal  Member         Kilbourn  Formation         Caseyville  Formation             Wyoming Hill Coal  Member             Wildcat Den Coal  Member MISSISSIPPIAN (subsystem of Carboniferous System)  SYSTEM         Pella (Ste. Genevieve)  Formation         St. Louis  Formation             Waugh  Member             Verdi  Member             Yenruogis Sandstone  Member             Croton  Member         Spergen  Formation     Augusta  Group         Warsaw  Formation         Keokuk  Formation             Bentonsport  Member             Montrose Chert  Member         Burlington  Formation             Cedar Fork  Member             Haight Creek  Member             Dolbee Creek  Member     Sub-Augusta  Group         Gilmore City  Formation             Humboldt Oolite  Member             Alden Limestone  Member             Iowa Falls Dolomite  Member         Maynes Creek  Formation             Eagle City  Member             Wassonville  Member     North Hill  Group         Chapin  Formation         Starrs Cave  Formation         Prospect Hill  Formation         McCraney  Formation DEVONIAN  SYSTEM     Yellow Spring (New Albany)  Group         Maple Mill  Formation             English River  Member             Saverton  Member             Grassy Creek  Member         Aplington  Formation         Sheffield  Formation         Sweetland Creek  Formation         Lime Creek  Formation             Owen  Member             Cerro Gordo  Member             Juniper Hill  Member     Cedar Valley  Group         Shell Rock  Formation             Nora  Member             Rock Grove  Member             Mason City  Member         Lithograph City  Formation             Idlewild  Member             Thunder Woman Shale  Member             Andalusia  Member             Osage Springs  Member             State Quarry  Member         Coralville  Formation             Iowa City  Member             Gizzard Creek  Member             Cou Falls  Member         Little Cedar  Formation             Hinkle  Member             Eagle Center  Member             Chickasaw Shale  Member             Bassett  Member             Rapid  Member             Solon  Member     Wapsipinicon  Group         Pinicon Ridge  Formation             Davenport  Member             Spring Grove  Member             Kenwood  Member         Otis  Formation             Cedar Rapids  Member             Coggon  Member         Spillville  Formation             Lake Meyer  Member         Bertram  Formation Devonian/Ordovician undiff.  SYSTEM SILURIAN  SYSTEM         Gower  Formation             Brady  Member             Anamosa  Member             LeClaire  Member         LaPorte City  Formation         Scotch Grove  Formation             Palisades-Kepler  Member             Waubeek  Member             Buck Creek Quarry  Member             Welton  Member             Johns Creek Quarry  Member         Hopkinton  Formation             Picture Rock  Member             Farmers Creek  Member             Marcus  Member             Sweeney  Member         Waucoma  Formation         Blanding  Formation         Tete des Morts  Formation         Mosalem  Formation         Tete des Morts/Mosalem undiff.  Formation ORDOVICIAN  SYSTEM         Maquoketa  Formation             Neda  Member             Brainard Shale  Member             Ft. Atkinson Limestone  Member             Clermont Shale  Member             Clermont-Brainard undiff.  Member             Elgin Limestone  Member             Scales  Member     Galena  Group         Dubuque  Formation             Littleport  Member             Luana  Member             Frankville  Member         Wise Lake  Formation             Stewartville  Member             Sinsinawa  Member         Dunleith  Formation             Wyota  Member             Wall  Member             Sherwood  Member             Rivoli  Member             Mortimer  Member             Fairplay  Member             Eagle Point  Member             Beecher  Member             St. James  Member             Buckhorn  Member         Decorah  Formation             Ion  Member             Guttenberg  Member             Spechts Ferry  Member         Decorah/Platteville undiff.  Formation         Decorah/Platteville/Glenwood undiff.  Formation         Platteville  Formation             Quimbys Mill  Member             McGregor  Member             Pecatonica  Member     Ancell  Group         Glenwood  Formation             Starved Rock Sandstone  Member             Harmony Hill  Member         St. Peter Sandstone  Formation             Tonti  Member             Readstown  Member         Winneshiek Shale  Formation     Prairie du Chien  Group         Shakopee  Formation             Willow River  Member             New Richmond  Member         Oneota  Formation Cambrian/Ordovician undiff.  SYSTEM CAMBRIAN  SYSTEM         Jordan  Formation             Coon Valley  Member             Waukon  Member             Van Oser  Member             Norwalk  Member         St. Lawrence  Formation             Lodi  Member             Black Earth  Member     Tunnel City  Group         Lone Rock  Formation             Reno  Member             Tomah  Member             Birkmose  Member         Adel  Formation         Wonewoc  Formation             Ironton  Member             Galesville  Member         Bonneterre  Formation         Bonneterre/Eau Claire undiff.  Formation         Eau Claire  Formation         Mt. Simon  Formation PROTEROZOIC  SYSTEM         Sioux Quartzite  Formation         Washington County Quartzite  Formation         Cedar Rapids Quartzite  Formation         Hull Rhyolite  Formation         Harris Granite  Formation         Hawarden Granite  Formation     Camp Quest  Group         LeMars Gneiss  Formation         Matlock Banded-Iron  Formation ARCHEAN  SYSTEM         Lyon County Gneiss  Formation