_Maple Park, Kane County._—Doctor Rufus M. Bagg recorded in 1909 (Bull. Univ. Ill., vol. VI, No. 17, p. 50, plate IV) the discovery of a large part of the skeleton of a mastodon. It was found at a depth of 6 feet. The exact location was not given.
The whole of Kane County lies between or is covered by the Bloomington and Marseilles moraines, and the mastodons found there must have lived after the retirement of the ice which produced those moraines.
26. _Glencoe, Cook County._—In Netta C. Anderson’s list, on page 9, Professor James G. Needham, of Lake Forest University, reported that a fragment of a mastodon’s tooth had been dug up while a ditch in glacial drift was being made.
Glencoe is situated on the eastern till ridge, as described by Leverett (Monogr. U. S. Geol. Surv., XXXVIII, p. 381), the one nearest the western shore of Lake Michigan. If the tooth mentioned really occurred in undisturbed drift, it is possible that it was redeposited from some earlier interglacial deposit.
In 1891, W. K. Higley (Bull. Chicago Acad. Sci., vol. II, pt. 1, p. XV) reported the finding of some bones of a mastodon, about 6 years previously, on the south side of Wicker Park, near Milwaukee Avenue, Evanston. The bones were in a layer of fine sand in which were trunks of oak trees. The depth was 13 feet. The remark was made that the level marked the upper or late limit of the mastodon.
1. _Dover, Racine County._—In the Milwaukee Public Museum is a tusk, identified as that of a mastodon, exhumed from a peat-bog at Dover, in 1878. Both tusks and some fragments of a scapula, some ribs, and vertebræ were found, but apparently no teeth. Only one tusk was saved; 4 feet 8 inches long and moderately curved, the middle of the concave surface being about 6 inches below a line joining the base and the tip of the tusk.
Dover is situated near the southern border of Racine County, in the southwestern corner of township 3 north, range 20 east. It is, therefore, within the great composite moraine which runs along the western side of Lake Michigan. According to Alden’s map (Prof. Paper 106, U. S. Geol. Surv., plate III) the town is on a tract covered by ground moraine of the Lake Michigan glacier.
2. _Waukesha, Waukesha County._—In the Milwaukee Public Museum is a slightly worn upper hindermost molar of a mastodon, No. 3867, labeled as having been found at Waukesha. There is no other history. The geological age is probably practically the same as that of the tooth found at Dover, Late Wisconsin.