278 LIFE OF THE PLEISTOCENE 



on account of the lack of stratigraphical data. To this class belong many of 

 the records of Winchell, Whittlesey, and other early Ohio geologists. 



11. CANADA 



The Yarmouth Interglacial interval is apparently represented in southern 

 British America, west of the 100th meridian. This area is covered by the 

 Wisconsin drift sheet, which rests upon the Kansan drift sheet. Interglacial 

 deposits between these sheets are probably to be referred to the Yarmouth 

 interval, tho some may represent other intervals between these two stages. 

 Strata immediately overlying the lower (Kansan) drift are probably correctly 

 referred to the Yarmouth interval. 



On the Rolling River, a tributary of Swan River, west of the 101st meridian, 

 in Manitoba, a section was observed by Mr. J. B. Tyrell, which is reproduced 

 below: 140 



1. Stratified gravel 10? feet inches 



2. Unstratified till with striated boulders 22 " " 



3. Stratified sandy clay, becoming a pure laminated clay at the bottom, 



where it contains many fresh water shells and diatoms 6 " ' 



4. Stratified gray sandy clay 20 " " 



5. Slightly sandy stratified clay, colored dark brown with bituminous mat- 

 ter, and containing a few small bivalves 1 " 10 



6. Plastic clay 5 " " 



7. Coarse stratified sand 12 " " 



8. Covered to water 12 " " 



Height of section 88 " 10 " 



Eight species of mollusks were obtained from the deposit No. 3. 



Lymnaea catascopium (short spired variety) Planorbis bicarinatus{ = antrosus) 

 Valvata trkarinata " parvus? 



" (keelless variety, = ecarinala?) Pisidium abditum 



Amnicola limosa porata? Spkaerium striatinum 



With the shells also occured a number of diatoms as well as several 

 higher plants, which are enumerated below: 



Elodea canadensis Vallisncria spiralis 



Taxus canadensis 



At Churchbridge, on the Manitoba and Northwestern Railway, a well 

 showed the following section: 141 * 



1. Sandy loam 8 feet 



2. Clay with gravel and small stones 12 ' 



3. Gray sand 2 " 



140 Can. Geol. Surv., 1890-91, p. 116E, 217E, 1892. 

 '*' Op. tit., p. 142 E. 



