MKill-I.KVKI. I'.KACIIKS loO 



iiiul rock cHlls ill the rear, aiul can hardly he accounted for as l)eh)nL;in<^ 

 to the extraordinary river vallc}'" descrihed hy Mr Taylor farther south 

 on the same escarpment, where only one-half of the channel of the m'er 

 is left, its eastern side, which was of ice, having melted away. As exam- 

 jiles may he mentioned a terrace at 1,521 feet on the l^lue mountains 

 near Collingwood, where a terrace large enough to contain several fields 

 lies immediately below a sharp limestone clifl', and terraces at 1,420 feet, 

 with rock clif!s in the rear, south of Meaford, on the same escarpment, 

 showing plaijily on both sides of a dee[) valley which cuts for a mile or 

 two into the tableland. In the latter case, especially, it is hard to see 

 how an3'thing else than static water could have done the work. The 

 same is true of the broad Proton [)lains which lie almost on to[) of the 

 old island referred to, at an elevation of 1,630 feet, according to Doctor 

 Si)eiicer,* and consist of clays apparently waterlaid. 



If the evidence just given be accepted, the waters by which the terraces 

 were made may have belonged to a higher lake Whittlesey before the 

 latter drained past Chicago. 



Beaches fauther North 



Within the last two years beaches have been found at similar eleva- 

 tions to the north of the Great lakes also. One is found about 30 miles 

 northwest of Michipicoten harbor, lake Superior, on the mountain })ort- 

 age between the waters of White river and Dog river. It is a very dis- 

 tinct terrace, of coarse but well rounded gravel and stones, 1,445 feet 

 above the sea, and has been shown by Professor Willmott to occur again 

 4 miles to the north, on Pokay lake, at about the same level. On Ob- 

 atonga lake, at the south end of the portage, there is a well marked and 

 extensive sand terrace at 1,380 feet, and one or two lower ones occur 

 near by, on the same chain of lake expansions, forming the uj)per part 

 of Dog river, all of them being well above the nearest pass to Hudson 

 bay, which is at Missanaibi, 70 miles to the east, and is 1,115 feet above 

 the sea. It is possible that these terraces were formed in the body 

 of water which made the highest beach on Keweenaw point, 150 miles 

 to the southwest, now about 1,200 feet above the sea, the difference 

 being accounted for by the greater amount of elevation toward the 

 northeast. 



. If these terraces were of marine origin the arm of the sea which pro- 

 duced them must have been man}' miles broad and hundreds of feet 



♦The railwaj' level for Proton is 1,582, and the track has about the level of the plain, which 

 seems to make the elevation 50 feet less than that mentioned. 



