POSTGLACIAL BIOTA OF THE GREAT LAKES REGION 141 



body of water drains into the St. Joseph River, thru Pipestone Creek. Marl 

 beds similar to those of Magician Lake occur in Pipestone Lake, from which 

 the mollusks noted below have been obtained: 



Sphaerium simile{= sulcatum) Planorbis trivolvis 



striatinum " antrosus 



Pisidium compressum " antrosus angistomus 



" variabile " antrosus striatus 



" splendidulum " campanulatus 



Vaivata tricarinata " deflectus 



Amnicola limosa parva " kirsutus 



" lustrica " parvus. Many monstroscities 



Physa niagarensis Galba obrussa decampi 



" heterostropha " obrussa exigua 



Lymnaea stagnalis appressa 



These moUusks evidently migrated to Pipestone Lake either by way of the 

 Chicago outlet, the St. Joseph River, and Pipestone Creek, or up the Kankakee 

 and St. Joseph rivers. It is probable that both routes contributed to the faunas 

 of these lakes. 



Galba baker i has been described by Walker from a marl deposit in the bottom 

 of Pine Lake, near Charlevoix. 62 



6. Vertebrate Animals 



A number of vertebrates have been reported from the postglacial deposits 

 of Michigan. A few of these have been noted in the preceding pages. Addi- 

 tional records are listed below. Lane cites the presence of both mammoth and 

 mastodon. 63 



Mammoth. Grand Ledge, Eaton County, one foot from surface in a low 

 swale once a duck pond; Pere Marquette shaft, no. 2, East Saginaw, Saginaw 

 County, 25 feet above the lake, 2j^-3 feet below the surface. 



Mastodon. Eau Claire, Berrien County, in ditch; Lenawee County and 

 Shiawassee River, in Howell Township, found while dredging river; Hillsdale, 

 Hillsdale County,in swamp ;Clinton, Lenawee County; Olivet, Eaton County; 

 Williams Township, Bay County, in deep hole of mucky soil, 3 feet below the 

 surface; Parr, Midland (or Allegan) County. 



Many years ago, Winchell 64 listed the following records of the mastodon: 



Seven miles from Adrian, Lenawee County, two feet below the surface, in 

 a peaty bog. A section of the bog showed peat 2}^ feet, marly clay 4 feet, 

 loose sand at bottom. The balance of the records are without specific data 

 as to stratigraphic location. Petersburg, Monroe County; Utica, Macomb 

 County; Green Oak, Livingston County; Fentonville, Oakland County; Terre 



a Nautilus, XXII, p. 18, 1908. 



ra Rep. State Board Geol. Surv. Mich., 1901, pp. 252-253. 



84 Amer. Joum. Sci., (ii), XXXVTII, pp. 223-224, 1864. 



