DOWUS’Q. 
oeneral description 
19 F 
valley show sandy deposits which arej)robably the shore deposits when 
the sea tl inked the eastern edge of this plateau. Their nature was 
not worked out, owing to lack of time, but there is litile doubt that 
beaches may be found in this vicinity. Through the old valley the 
river is now cutting another channel and for ten miles upward the Kivcr cutting 
stream is very active and is wearing rapidly through the clay. Above channel, 
this the grade i.s not so steep and conseijuently the current is much 
slower. The iramodiato banks of the stream in many place.s do not 
reach the side.s of the old valley, hut the higlior plateau is in view at 
many points and finally, before reaching the mouth of the Washagami, 
the river .seems to he flowing in a much narrower valley with occa- 
sional cut Imiks, apparently the old channel slightly deepened. The 
active part of the revived stream has not yet reached the underlying 
rock, and its work is retanled by an occasional accumulation of boul- 
ders. About si.x inile.s below the Washagami a sudden bend of the 
stream to the south ha.s thrown the current against the south bank, 
and excavation on a large scale is going on in this locality. 
The high plateau here entered, as well lus its eastern slope to .I.ames iM.atcau cover- 
bay, is covered by a coating of marine clay which probably overlie.s 
boulder clay. That some of this exists beneath the marine clay is 
proved at only one or two small e.\{)osure.s. It probably, in many places, 
contains no boulders and therefore the dividing line between it and 
the marine clay is hard to define. The reddish clay near the mouth 
of this river, although inaiiil}’ free from boulders, appears to have 
received l•<■^l^>ur!Ilg matter from a soft red shah- which, though not 
outcropping on the hank may oi-cur in th<' bed of the river lielow the 
limestone. 'Phis may he a local development of the boulder clay, as 
wore it a ji.art of the marine deposit a more oxten.sivo distribution 
might be expei'ted. Largo boulders arc not numerous in the river 
channel, but at. intervals there are. accumulations of them. 8in.all 
roundel! linuldens and pebbles are common, hut the majority .seem to 
come from the surface of the clay ortho upper part of the section. Ma- 
rine shells were collected from the banks near the to}> of the exposures, 
and these are of the same spei ii‘.s a-s those recorded Mn a previous |w».ge 
as having been found near the mouth of the stream. The .same -species DigiTcntijil 
were also collected from the higher parts of the plateau at an elevation of 
four hundred feet above tide, showing that all this region was suhmor- 
god at the close of the ghwual porioii, to at len.st between four ami five 
hundred feet. The uplift .'ilnco then has been greater perhaps In (he 
northern p.ai t of this ai'ca than in that to the south near the hoight- 
of-land. This differential uplift i.s clearly shown in the area to the 
west formerly covered by the glacial Taike Agassiz, where the highest 
U_p_2| 
