V. 
GEOLOGY AND LITHOLOGY OF MICHIPICOTEN BAY. 
Results of the Summer Laboratory Session of 1886. 
C. L. Herrick, W. G. Tight, and H. L. Jones. 
\Read before the Denison Scientific Association, April 23, 1886.] 
The excursion was undertaken with a view primarily to the en- 
largement of the working series of crystalline rocks in our cabinet and 
in the hope of affording a useful supplement to the class-work in lith- 
ology, though it fell to the lot of but few of the class to participate in 
it. It is hoped that these peripatetic summer training classes may be- 
come a valuable adjunct to the regular work so long, at least, as we 
have, as now, numbers who expect to work as scientific specialists. 
The party left the Sault Ste. Marie, on the little steamer Remora, 
and arrived at the fishing station near the mouth of the Dog River, in 
Michipicoten Bay, at 4 o’clock in the afternoon when, by the kindness 
of the agent, we were promptly transported to our permanent camping 
station on the left bank of the Dog River at its mouth. Here a tem- 
porary laboratory was located, and by means of oars and sail much of 
the adjacent coast was carefully studied. 
Those not particularly familiar with recent geological literature 
may ask why this special locality was chosen for the summer’s work 
and what is the nature of the problems whose solution was sought. 
To properly answer these questions would be to review in great part 
the writings of most of our leading geologists during a period of many 
years, especially those of Canada, Michigan and Wisconsin. Such 
an extended review is, however, rendered unnecessary by the fact that 
