THE IOWAN ICE INVASION 



355 



The exposure occurs in Coal Creek, several miles within the Wisconsin drift 

 border. The section is noted below, no fossils being mentioned : 



Section of bluff of Coal Creek near corners of sees. 29, 30, and 32, T. 12, R. 3 E. 



Till (Wisconsin), yellow at top but shading into blue-gray at bottom 20 feet 



Soil, black (Peorian) 1 foot 



Silt or clay, pale greenish yellow, pebbleless (post-Sangamon) 3 feet 



Till (Ulinoian), weathered and leached brown, exposed 5 feet 



Height of Section 29 feet 



8. MISSOURI 



Deposits said to be later than the post-Kansan loess occur along the Mis- 

 souri River, on the border of the Kansan drift sheet. Mr. F. A. Sampson has 

 collected extensively in these deposits and has obtained the species listed 

 below. At Providence, Boone County, " the deposit is of later period than the 

 Kansan loess, and is not the fine silt of the loess, but is of clay intermixed with 

 stones of various sizes." 38 The species noted from Providence and Lupus 

 are listed below: 



Providence, Boone County Lupus, Moniteau County 



Polygyra profunda Polygyra profunda 



" albolabris alleni " albolabris alleni 



" thyr aides " thyroides 



" elevata " elevata 



clausa (scarce) " clausa (scarce) 



pennsyhanica " pennsylvanica 



" appressa " appressa 



" in fleet a " inflect a 



fraterna " fraterna 



monodon " tnonodon 



" hirsuta " hirsuta 



Succinea ovalis (one specimen) 



Gastrodonta ligera (one specimen) 



Helicina occulta (scarce) Helicina occulta (scarce) 



Vitrea indentata 



" hammonis? 



Zoniloides minusada 



" milium 



Bifidaria armifcra 



" contracta 



Pyramidula solitaria Pyramidida solitaria 



alternata aliernata (rare) 



perspectiva (one speciman) perspectiva (one specimen) 



Helidiscus parallelus 



Carychium exile 



"Sampson, Nautilus, XXVIII, pp. 15-17. 



