108 2%e American Geoioyisz. August, i896 
antimony sulphids, play the most important part. Tliese 
conclusions are proven by the constant paragenesis of gold 
and quartz and the almost universal association of gold with 
pyrite and its products. That gold is also sometimes precipi- 
tated by organic substances is rendered probable l)y the occur- 
rence of veins in the Transvaal whose bituminous portions 
ai-e nnusuall}^ rich in gold. 
NOTES ON THE QUATERNARY GEOLOGY OF THE 
MATTAWA AND OTTAWA VALLEYS. 
By F. B. Taylor, Fort Wayne, Iiid. 
Introductory. In the autumn of 1893 the writer made two 
excursions to North Bay on lake Nipissing, first in August 
with Dr. F. S. Pearce, of Philadelphia, and again in Septem- 
ber alone. Two or three days were spent each time searching 
for old shore lines on the hills or in studying the lower 
beaches and their relation to the old outlet of the great 
lakes. The greater part of the time, however, was spent in 
searching for high beaches, and particularly in an ett'ort to 
identify the highest. The observations made then were after- 
wards published in detail.* 
In 1895 the month of October was spent chiefly in the vi- 
cinity of North Bay and in the Ottawa valley above the city 
of Ottawa, It is the particular object of the present paper to 
present the results of this later work. The observations are 
somewhat scattered, but when taken in connection with what 
has been done by others and with the writer's work of two 
years before it is believed that they will not be without value. 
The paper is presented in two parts, the first renting to the 
higher, older shore lines, and the second relating to the lower^ 
newer lines, in part lacustrine and associated with the aban- 
doned outlet and in part to those of the contemporary marine 
waters in the Ottawa valley. 
I. Shore Lines at High Levels. 
North Bail. The Nelson and McEwen beaches on the hills 
five miles northeast of North Bay were described in the pre- 
*BuIl. Geol. See. Am,, vol. 5, 1893. Contains map of old outlet and 
of higher beaches north of North Bay. Also Am. Geol., vol. xiv, Nov., 
1894, pp. 282-285, with map. 
