_Conspectus of the Geology and Vertebrate Paleontology of the Pleistocene._
┌────────────────┬─────────────────────┬─────────────────┬──────────────────┐ │ 1 │ 2 │ 3 │ 4 │ │Drift-sheets and│ Representative │Disappearance of │ Characteristic │ │other deposits. │ collections. │ genera and │ genera. │ │ │ │ species. │ │ ├────────────────┼─────────────────────┼─────────────────┼──────────────────┤ │ _Wisconsin │ │ │ │ │ Stage._ │ │ │ │ │Atlantic to │Made in swamps and │Megalonyx, │Existing mammals, │ │ Pacific in │ old lakes on │ Elephas, │ plus those of │ │ Wisconsin, │ Wisconsin drift │ Mammut, │ column 3 │ │ Illinois, │ (Wabash beds) from │ Cervalces, │ │ │ Iowa, Indiana,│ Illinois to │ Symbos, │ │ │ Ohio, New │ Massachusetts and │ Boötherium, │ │ │ York, New │ Cape Breton Island.│ Mylohyus, │ │ │ Jersey (Cape │ Leda clays, Canada.│ Platygonus │ │ │ May, Trenton │ │ Bison │ │ │ gravels), │ │ occidentalis, │ │ │ Ontario, │ │ Castoroides │ │ │ Quebec, etc., │ │ │ │ │ Maine, │ │ │ │ │ Massachusetts.│ │ │ │ │_Peorian Stage._│ │ │ │ │Old soils │Fossil mammals rarely│None certainly │Few recognized. In│ │ between the │ found. │ known. │ general, those │ │ Iowan and the │ │ │ of the │ │ Wisconsin │ │ │ Wisconsin. │ │ drifts where │ │ │ │ │ the former is │ │ │ │ │ present. │ │ │ │ │ Reported by │ │ │ │ │ Leverett (Mon.│ │ │ │ │ U. S. Geol. │ │ │ │ │ Surv., vol. │ │ │ │ │ XXXVIII) from │ │ │ │ │ localities in │ │ │ │ │ Illinois. │ │ │ │ │ Usually hard │ │ │ │ │ to distinguish│ │ │ │ │ from Sangamon.│ │ │ │ │ Abundant loess│ │ │ │ │ in Mississippi│ │ │ │ │ Valley. │ │ │ │ │ _Iowan Stage._ │ │ │ │ │Known certainly │None. │Mylodon, Tapirus,│None known; but in│ │ only from Iowa│ │ Equus, │ general those of│ │ and Wisconsin.│ │ Taurotragus, │ the later │ │ Supposed to be│ │ Sangamona, │ stages. │ │ present along │ │ Bison │ │ │ New England │ │ latifrons, B. │ │ │ coast, Gay │ │ antiquus, │ │ │ Head to Maine.│ │ Ænocyon, │ │ │ │ │ Dinobastis, │ │ │ │ │ Smilodon, │ │ │ │ │ Smilodontopsis.│ │ │ _Sangamon │ │ │ │ │ Stage._ │ │ │ │ │Sangamon River, │Alton, Illinois; │None known to │Mylodon, a few │ │ Illinois. Old │ Kimmswick, │ have become │ horses, tapirs, │ │ soils just │ Missouri; cave in │ extinct during │ peccaries, │ │ above the │ Bexar County, │ this stage. │ Sangamona, │ │ Illinoian │ Texas; bluffs at │ │ Taurotragus, │ │ drift. Some │ Natchez, │ │ Symbos, Bison │ │ loess of this │ Mississippi; salt │ │ latifrons, B. │ │ stage. Cave │ mine at Petite │ │ antiquus, │ │ deposits in │ Anse, Louisiana; │ │ Elephas and │ │ Texas and in │ Cavetown and │ │ Mammut. │ │ the Alleghany │ Corriganville, │ │ │ │ Mountains. │ Maryland; Ivanhoe, │ │ │ │ │ Virginia; │ │ │ │ │ Whitesburg │ │ │ │ │ Tennessee; │ │ │ │ │ interglacial beds │ │ │ │ │ at Toronto, │ │ │ │ │ Ontario. │ │ │ │ _Illinoian │ │ │ │ │ Stage._ │ │ │ │ │In Illinois, │Conard fissure, │May include some │Equus, Mylohyus, │ │ Wisconsin, │ Newton County, │ accredited to │ Symbos, Felis, │ │ eastern Iowa, │ Arkansas. Otherwise│ the Kansan. │ Smilodontopsis, │ │ Indiana, Ohio.│ none recognized. │ │ Dinobastis. │ │ Supposed │ │ │ │ │ glacial drift │ │ │ │ │ from Long │ │ │ │ │ Island to │ │ │ │ │ Massachusetts │ │ │ │ │ (Montauk till,│ │ │ │ │ etc.). │ │ │ │ │ _Yarmouth │ │ │ │ │ Stage._ │ │ │ │ │Interglacial │Few vertebrates yet │Not known. │Few known. │ │ soils and │ recognized. Skunk │ │ Doubtless those │ │ mucks between │ and rabbit at │ │ which became │ │ the Kansan and│ Yarmouth, Iowa. │ │ extinct during │ │ Illinoian in │ │ │ Illinoian and │ │ Iowa and │ │ │ Iowan and later.│ │ Illinois. │ │ │ │ │ Gardner clay │ │ │ │ │ and Sankaty │ │ │ │ │ from Long │ │ │ │ │ Island to │ │ │ │ │ Boston. │ │ │ │ │_Kansan Stage._ │ │ │ │ │Iowa, Missouri, │Fossil vertebrates │Megatherium, │Doubtless those in│ │ Kansas, and │ rarely found. │ Glyptodon, │ the later stages│ │ northwestward.│ │ Stegomastodon, │ of this column │ │ Loess │ │ Anancus, │ and some of │ │ overlying the │ │ Gomphotherium?,│ those of this │ │ drift; │ │ Elephas │ stage in column │ │ Jerseyan │ │ imperator, │ 3. │ │ drift. New │ │ Eschatius, │ │ │ Jersey (may be│ │ Camelops, │ │ │ Nebraskan); │ │ Camelus, │ │ │ Pensauken. │ │ Hydrochœrus │ │ │ Jameco gravels│ │ Aftonius, │ │ │ on Long │ │ Leptochœrus, │ │ │ Island, New │ │ Trucifelis. │ │ │ York, and Cape│ │ │ │ │ Cod, │ │ │ │ │ Massachusetts.│ │ │ │ │ _Aftonian │ │ │ │ │ Stage._ │ │ │ │ │Gravels and │Along Missouri River │None recognized. │Mylodon, │ │ soils between │ in Iowa; Fossil │ Probably some │ Megalonyx, │ │ the Kansan and│ Lake, Oregon; │ of those cited │ Megatherium, │ │ the Nebraskan │ Grayson, Sheridan │ under the │ Glyptodon, │ │ in Iowa, │ County, Nebraska; │ Kansan.