136 



LIFE OF THE PLEISTOCENE 



the eastward. The elevation is about 601 feet"; 14 species are recorded from 

 this locality. 



Musculium secure 

 Pisidium contortum 



" rotundatum 



" scutellatum 



" variabile 



" ventricosum 



" ventricosum costalum 



Galba obrussa( = desidiosa) 



" palustris 

 Physa elliptica 

 Planorbis parvus 



" trivolvis 

 Succinea retusa 

 Valvata sincera 



Sand deposits thot to be of Algonquin age occur in a cut between section 24 

 and 25, in Spaulding Township, Saginaw County. 57 The following species have 

 been identified: 



Unio species 



Sphaerium simile{ = sidcatmn) 



Pisidium compressum 



" variabile 



" walkeri 

 Goniobasis livescens 

 Plcurocera species 

 A mnicola limosa 

 Campcloma integrum 

 Physa species 



Physa gyrina 



" elliptica 

 Planorbis antrosus( = bicarinahis) 



" campanidatus 



" trivolvis 



" partus 

 Galba palustris 



" reflexa 

 Lymnaea stagnalis appressa 

 Polygyra albolabris 



Some years ago, Mr. A. W. Slocum collected a number of mollusks from 

 marl beds at Oden and Kegomic, Emmet County. Oden lies between the 

 Algonquin and Nipissing beaches, in fact is really on the Nipissing beach, while 

 Kegomic is on the old lake floor. These marl deposits are reported as upwards 

 of sixty feet in thickness, and the deposits, especially at Kegomic, probably 

 represent both the Algonquin and the Nipissing stages. The large lakes, Burt 

 and Mullet, as well as the smaller lakes, Crooked, Pickerel, etc., ar^ relics of 

 the wide strait which, during these lake stages, connected Lake Huron with 

 Lake Michigan and separated portions of Emmet and Cheboygan counties 

 from the lower peninsula, the former territory then being an island, with the 

 Straits of Mackinac on the north. The following species of mollusks have been 

 identified from the two localities: 



Spltaerium striatinum 

 Physa niagarensis 

 Planorbis antrosus 



Sphaerium striatinum 

 Musculium secure 



Oden 



Kegomic 



Planorbis campanulatus 

 Galba emarginala canadensis 

 Lymnaea stagnalis appressa 



Pisidium contortum 

 Physa niagarensis 



67 Geol. Surv. Mich., VIII, part ii, pp. 97-102. Mollusks are listed from several other 

 localities, but none seem to be from deposits made by the ice-bound lakes, other than those 

 listed. 



