THE NEBRASKAN ICE INVASION 



243 



Wing cases, species undetermined 



Mud turtle 



* Megalonyx leidyi? Lindahl 



* Equus complhatus Leidy 



* " laurentius Hay 



* " niobrarensis Hay 



* Mylohyus? temtrarius Hay 



* Camelops kansanus Leidy? 



* Alces shimeki Hay 



* Aftonhis cahlni Hay 



* Mammut americanum (Kerr) 



" progenium Hay 



* Rhabdobunus mirificus (Leidy) 



Castor canadensis 



* Castoroides ohioensis Foster 



kanscnsis Martin 



Ursus americanus Pallas 



INSECTA 

 COLEOPTERA 



VERTEBRATA 

 REPTILIA 



MAMMALIA 94 



Megatheriidae 



* Mylodon harlani? Owen 

 Equidae 



* Equus excelsus Leidy 



* Neohipparion gratum (Leidy) 



Tayassutdae 



* Platygonus compressus Le Conte 

 Camelidae 



* Camelus species 

 Cervtdae 



BOVIDAE 



* Bison, cf. alleni Marsh 

 Elephantidae 



* Elephas primigenius Blum. 



* " columbi Falconer 



* " imperator Leidy 



Castoridae 



Castorotdidae 



Ursidae 



IV. Summary 

 The Aftonian Interglacial Stage is known to have extended from south 

 central Minnesota, south to northern Missouri, and from eastern Nebraska 

 and South Dakota eastward to western Illinois and Wisconsin. It has been 

 definitely recorded from almost every part of Iowa; its wide distribution is 

 shown by the list of counties (39) indicated below. 



Buchanan 

 Benton 



Fayette 

 Fremont 



Lyon 

 Linn 



Pottawattamie 

 Sioux 



** An * indicates that the animal is extinct. 



