110 27/e American Geoloyist. February, 1895 
ton is 1.38 foot por iiiilo. This rate clecroasos toward the 
south and increases toward the north. Speaking of the Al- 
gonquin beacii aU>ng this shore he says thatitis "often broken 
up into a series of prominent ridgelets, the lowest being, 
where developed, as much as 28 feet below the upper.'"* This 
is a very marked feature of the Nipissing beach in many 
places. 
Concerning the beaches of the south coast of Georgian bay, 
Dr. Spencer says: "There are several beaches about Georgian 
ba)'^, at lower altitudes than the Algonquin, Init these rise less 
rapidly toward the northeast than the greater named beach. 
At Clarksburg there is a beach at 81 feet above the lake, and 
terraces at 62 and 45 feet, besides a numerous series of beaches 
extending from 28 feet down to the water level. Near W^'e- 
bridge, the more conspicuous terraces are at about 183,73. 55 
and 11 feetabove the lake ;and there are numerous fainter shore 
lines." Wyebridge is only about nine miles south of Midland, 
and it seems more than probable that the beach of 55 feet at 
the former place is the same as that of 50 feet which I ob- 
served at the latter, and that there is some discrepance in my 
measurement. Clarksburg is about 80 miles southwest of 
Midland and the Nipissing beach should be expected there 10 
or 15 feet lower. Dr. Spencer's beach at 45 feet at that 
place seems to fit the case very closely, and the numerous 
beaches below 28 feet add still more of the Nipissing ({uality. 
It is further notable that this "numerous series" keeps to a 
low level, as would be expected if it were of Nipissing age. 
In short, so far as the evidence goes, it shows that the Nipis- 
sing beach is in its normal place on these shores and lies about 
in the same plane as those parts of it which have been traced 
on shores 200 to 500 miles to the northwest. If these points 
of identification are correct, then the Nipissing beach should 
be about 35 feet above lake Huron at Southampton, and 
should pass under the lake at a point about 10 miles south of 
Goderich. Thus at all points above the lake level the Nipis- 
sing beach is below the Algonquin, although it is estimated to 
strike almost exactly at the same level under the lake off Sar- 
nia. The higher, steeper Algonquin beach which rises more 
*Op. cit., p. K). Next (imitation from samo page also. 
