PREGLACIAL CONDITIONS AND LIFE 209 



C. HAY SPRINGS FAUNA, NEBRASKA 



In the northwestern part of Nebraska, at Hay Springs, near the Niobrara 

 River, a plains fauna has been found which is comparable in point of time with 

 the Port-Kennedy biota. The mammals as listed by Matthew are as follows. 41 



Canis latrans Equus? scotti 



? Dinocyon species Elephas columbi 



Felidae (foot bones of several species) Platygonus vetus 

 Fiber zibethicus " compressus 



Aroicola cf. ampkibius ( = Microlus) Leptochaerus species 



Cynomys cf. ludoviciamis Camclops kansanns 

 Thomomys species " vitakerianus 



Castoroides species Camelus americanus 



Paramylodon nebrascensis Antilocapra cf. americana 



Equus coinplicatus Capromeryx furcifer 

 " fraternus 



d. OTHER FAUNAL AREAS 



In Kansas a fauna has been reported by Udden 42 which, judging by the 

 species represented, might be referred to the Aftonian stage. Howarth and 

 Beede, 43 however, do not tiink that these deposits, which extend thru McPher- 

 son, western Marion, Harvey, and eastern Reno counties, are in any way con- 

 nected with the Kansan ice, the altitude of McPherson County being much 

 higher than that of the nearest Kansan drift. The deposits are in an old river 

 valley (probably preglacial) cut in the underlying bed rock, and the deposits 

 are thot possibly to be the result of a change of drainage at which time a greater 

 volume of water flowed thru the valley. Hay 44 refers the vertebrate remains 

 in the gravel (number I) to the Pliocene, and this is probably the best disposi- 

 tion. The deposit s present the following section : 



V. Yellow sand 

 IV. Volcanic dust 

 III. Clays 



II. Sand 



I. Gravel 

 Rock 



In the gravel number I the following mammals were found: 



Megalonyx leidyi Equus complicates 



41 Bull. Amer. Mus. Nat. Hist., XVI, pp. 317-322, 1902; Brown, op. cit., XIX, pp. 

 569-584, 1903. 



42 Amer. Geol., VII, pp. 340-345. 



43 Univ. Geol. Surv. Kansas, II, p. 287. 

 "Bull. 179, U.S. Geol. Surv., p. 578. 



X 



