THE ILLINOIAN ICE INVASION 299 



County which appears to be referable to the Sangamon. A well section near 

 the City of Peoria presented the following order of strata: 74 



1 Brown prairie clay and soil 12 feet 



2. Coarse gravel and sand with boulders (Wisconsin) 35 " 



3. Clay and sand, forming 7-8 distinct beds, some containing coarse gravel and 



boulders (Hlinoian) 48 " 



4. Black, mucky soil, with limbs of trees, etc. (Yarmouth) 2 " 



5. Boulder clay (Kansan) 8 " 



Height of section 105 " 



In the bluff near Peoria a mastodon was found in a gravel bed, believed to 

 be the equivalent of number 2 in the above section. In Washington County 

 (at Beaucoup) 75 a mastodon is reported from reddish clay below yellow clay, 

 at a depth of about 18 feet below the surface, and in Marion County (at Sando- 

 val) a mastodon was observed in the same stratum at 12 feet below the surface. 

 In Ogle County 76 a mastodon tooth was secured from a tributary of Stillman's 

 Run and leg bones were found in the bank of Rock River at a depth of 5 feet, 



15 feet above the river. 



The elephant jaw recorded by McAdams 77 from Calhoun County may be 

 referable to the Sangamon. It was from drift clay, in the side of a ravine. A 

 mammoth tooth from Christian County, found in a sand drift near the South 

 Fork of the Sangamon River, may be referred to the same horizon. In Gallatin 

 County the remains of the mastodon and the mammoth have been found in 

 Sangamon deposits. At 'Half Moon' both the mammoth and mastodon occur 

 in a yellowish clay mixed with gravel, which underlies a salt lick. In Shawnee- 

 town mastodon teeth were found embedded in a shallow deposit of bluish 

 clay resting on yellow clay and gravel. 78 The Castor oldes reported by LeConte 

 from a well near Shawneetown, 40 feet below the surface, may also be referable 

 to the Sangamon interval. 79 Two records from Henry County are thot to be- 

 long to the Sangamon. Near Cambridge a part of a tusk was found in a well 



16 feet below the surface and from Penny's Slough a tooth was secured. This 

 latter may belong to a later time, however, perhaps post-Wisconsin. 



A number of records of mammals have been reported from Rock Island 

 County. 80 At Milan a tusk was found in the red 'ferretto' zone; at Rock 

 Island, in a cut thru the loess, which is here 35 feet thick, a tooth and a piece 

 of a leg bone of an elephant were found at a depth of 22 feet. The lower part 



74 Op. cit., V, p. 236. 



"Foster, Proc. Amer. A. A. Sci., X, p. 161. 



"Shaw, Geol. IU., V, p. 110. 



77 Trans. St. Louis Acad. Sci., X, No. 3, p. LXXIX. 



71 Anderson, Augustana Library Pub., No. 5, pp. 10-11. 



7 » Proc. Phil. Acad., VI, p. 53. 



M Anderson, op. cit., p. 17. 



