DOW LI. VO 
PO.ST TKRTI.\RY 
37 F 
guide described exposures of what seemed undoubtedly to be limestone 
of about tlie .same characteristics as that on tlie Ekwan river. 
POST TERTI.VRV. 
On all the rock exposures in the country adjacent to (he Kkwan 
river, where the expo.sed surfaces have not been subjected to denuding 
agencie.s, glacial .striie liave been recorded showing a movement of the 
ice mass toward the southwest. Only one exposure on the Ekwan 
showed such a striated surface, and this gave S. 40' W. All or nearly 
all the surfaces exjjosftd in the valley were eroded by river action and 
the s<’Ouring effect of ice in the .spring tlocsfs, so that the original 
glacial striae were obliterated. The till left by this ancient glacier is 
deposited in an even mantle over the .surface and con’aiiis a few 
boulders, but the fragmcntul portions of the mass are of small size 
The dopressionof the earth's surface, owing to the weight of the ice sheet, 
is shown hy the pre.sence of marine clay.s on the surface of the boulder 
cl \.y, and as tliese are of nearly the same compo-sition as the clays 
beneath, tlie line of demarcation is hard to define. The marine clays 
extend up tlie Ekwan river to past the mouth of the Washagami and 
northward to and surrounding the ridge of trap which protrudes 
through the plain at Sutton .Mill lakes. The cxlreme limit of submer- 
gence in tlu> dl.strict to the south is given by Dr Hell as bOO feet. 
Near Sutton Mill lakes the toj* of the marine | terrace now stands at 
400 feet above tide, so that the submergence of the present coast line 
was greater than this amount. The fo.ssils which determine these 
clay.s include the following sjiecies : Saricava 7-ityosa, Mya truncaUi, 
Macoma calcarea and Car’duun r.UialuTn. 
(Jlacial striae 
recorded. 
Tiiinit of 
submergence. 
