Morton. Plate 1 figure 19. 



Page 149 



" 1 " 20. 



» 149 



" 1 " 22-23. 



" 149 



314 LIFE OF THE PLEISTOCENE 



Unio terrains 



" saxulum 



Anodonta? abyssina 



With the Unios "one perfect form of a genuine oyster and several frag- 

 ments" were found. What these really were it is impossible to conjecture. 

 The molluscan record is practically worthless for the present purpose. 



Near Middletown, Butler County, in the first bottoms of the Miami River, 

 a stratum containing mollusks occurs which is evidently referable to the Sanga- 

 mon interval. It is to be correlated with the old shell and forest beds near 

 Lawrenceburg, Indiana, and in other parts of the Ohio Valley. Thirteen 

 species are recorded from Middleton. 144 



Name listed. Present name. 



Helix elcvata Polygyra elevata 



" concava Circinaria concava 



" allernata Pyramidida alternata 



" hirsida Polygyra hirsuta 



" monodon " monodon 



" thyroideus " thyroides 



" profunda " profunda 



" solitaria Pyramidida solitaria 



" tridentata Polygyra tridentata 



Goniobasis depygis Goniobasis depygis 



Planorbis triwkis Planorbis trivolvis 



Amnicola lapidaria Pomatiopsis lapidaria 



Succinea species Succinea species 



c. Mammalian Fauna 

 Mammals of Sangamon age occur above the Illinoian till in Ohio and that 

 portion of Kentucky which was reached by the till sheet. The most complete 

 fauna occurs at Big Bone Lick on Big Bone Creek, Boone County, Kentucky, 

 twenty miles south of Cincinnati, Ohio. Foster, 145 many years ago, called 

 attention to the position of the fossils as related to the strata. His section is 

 as follows: 



Yellow clay, containing remains of bison and deer 15-20 feet 



Blue clay, with remains of elephant and mastodon x 



The fauna has been monographed by Leidy 146 and has been referred to by 

 many other authors. 147 From these various sources the fauna is seen to be 

 made up of the following species: 



Megalonyx jeffcrsoni Alces amerkanus 



Mylodon harlani Rangifer caribou 



]M Geol. Surv. Ohio, III, pp. 381-391. 

 346 Proc. Amer. Assoc. Ad. Sci., X, p. 161, 1856. 

 '" Journ. Phil. Acad., VII, 1869. 



"' Cooper, Smith, and DeKay, Amer. Journ. Sci., (i), XX, pp. 370-372; Smith. Contr. 

 Knowl., V, Art., 3, 1852; VII, Art., 5, 1853. 



