

GLACIAL PHENOMENA AND SUPERFICIAL DEPOSITS. 
present vertical position, offer a much greater resistance to mechanical 
_ violence; and before its layers had been widened by frost and weather, 
‘i would support pressure and abrasion at right angles to its original 
bedding, almost as well as the most solid rock. So far as it goes, 
then, the close connection of the bed of the lake with the slaty rocks, 
' would tend to show that it had been deeply outlined by sub-aerial weather- 
ing, before being subjected to glacial action. All the harder rocks of the 
region still show with the utmost perfection the scratching and grooving 
of the glacial period, and some of the more compact granites and 
intrusive diorites, retain a surface still perfectly bright and polished. 
Though the general direction of the northern part of the lake closely 
follows that of the ice action, its form is probably due in the main to the 
strike of the rocks, which is parallel to its greatest diameter. Still, on a 
small scale, even the hardest and most homogeneous of the rocks show a 
tendency in the longest axis of their elevations, to parallelism with the 
glacial groovings. 
468. The following table, shows the directions of glacial striez 
observed on the rocks in the various parts of the lake, the bearings being 
magnetic.* The directions connected by a bracket, were observed to 
occur together on the same rock sui face :— 

N. W. Angle Inlet. Bigsby Island. 
Place. ‘Direction. Place. Direction. 
McKay Island....S 48°W to S 50° W SG OME (OF. fs as se yee 5 S 27° W 
mmckene stan... S. 2... S 35° W FE TEL ie ce ayes os SoS S 30° W 
MIC is d0d cinder SG prs a a9 S 39° W SP ake siee he EP EET Tey: S 20° W 
Wem pike. Obid oxig fared «xe a bd 
Southward from N. W. Angle Inlet Oy oe S 23° W 
ee ES ae mn eM RMS: ot i oe lk ae x S87 W 
WPAN? Sa ele mere Vin Aes « S 27° W Middle Island 
ART icy) tes aria Bae W.. || Bast! aide) of. 2... 0000004: S 5° W 
tat ad ee Pe eee ee 8 13° W 
Southern Promonitory. | SIAM OR sn a is ors oe S 25° W 
( S 23° W | North Island 
coal ake | Upp 2S SI DOP ena Cer 8 30° W 
Sor Ww. | 
S20°9E | North Shore Sand-hill Lake, District of 
S55°Ww Shebashea 
ce Wh gE Aenea S 25° W 
OAc laa EPS DALE B ey 8S 40° W 
N. of Rainy River (Mainland.) 7 TF Eee " E rie ~ 
S 12° W ee) DS eee eis S 25° W 
8S 30° W carne sr pb inte Bia nine S 20° W 
S 20° W ae TR aciots ba oe S 25° W 

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