d30 B. SHIMEK AFTOKIAN FOSSILIFEROUS GRAVEL AND SAND BEDS 



122, 136. Equus scotti, superior molars. 

 227. Equus scotti, lower molar. 

 184. Equus complicatus, premolar. 



229. Incisor of horse (?). 



Miscellaneous bones and teeth of Equus: 4 cannon bones (1690 '■> 

 phalanges (171-172, 195) ; a tooth (199), and fragments of 

 teeth (228). 



232. Equus , left radius (proximal end). 



197. Jaw of ruminant, fragment. 



230. Premolar of animal related to camel. 



231. Foot bones of camel (2). 



Various unidentified bones, mostly fragmentary. 

 Vertebra of a fish. Found in fine sand. 



Mollusks 



TJnio anodontoides Lea (?). Segmentina armigera. 



Unio , fragments of a heavier species. Pyramidula alternata. 



Sphwriwn sulcatum. Pyramidula striatella. 



Pisidium ." Vallonia gracilicosta. 



Amnicola . Vitrea hammonis. 



Valvata tricarinata. Zonitoides ar'boreus. 



Valvata Mcarinata. Bifidaria armifera. 



Ancylus rivularis. Succinea ovalis. 



Lymnwa caperata. Fragments of 2 or 3 other 

 Planordis parvus. species. 



7. Ordway pit. — This is located in the bluff on the southwest side of 

 the Maple Eiver, opposite Castana, Iowa, in the southeast quarter of sec- 

 tion 13, township 84 north, range xliv west. 



The Aftonian here rises about 40 feet above the Maple bottoms. The 

 section shows the following members present : 



Loess, abundant on the ridge above the section. 



Loveland, 5 to 6 feet. 



Kansan drift, 6 to 18 feet. 



Aftonian : fine, cross-bedded, with interstratified silt and other char- 

 acteristics of typical Aftonian, 5 to 8 feet. 



Aftonian ferruginous gravel, in part forming conglomerate plates, 

 3 to 4 feet. 



Both this and the folloMnng section are on a Kansan sloping bench with 

 no overljdng loess. The loess begins higher up on the slope, and the ridge 

 is capped with a thick deposit of it. 



In the northern part of the same pit a layer of gravel 3 feet in thick- 

 ness lies under the sand, and contained a stratum of mussel shells (mostly 



1* The species of Pisidium has not been determined, the recent revision of the genus 

 making this more difficult, bu.t It seems to be identical with the most common species 

 now living in the northwestern part of the state. 



