SS The American Geologist. February, 1894 
canadensis. The first two have not hitherto been reported 
from the Canadian drift. 
In order to show definitely the geological horizon ;tt which 
the fossils were found, the section exposed at Taylors' brick- 
yard has been measured, giving the following results: 
Feet. 
1. Sandy soil followed by brownish grey clay with boulders ... 3 
2. Stratified bluish grey clay (making buff brick). 69 
3. Brownish or drab clay, much jointed (making red brick).. . . 11 
4. Brownish yellow stratified sand 4 
5. Blue clay with peaty flakes 3 
6. Brown sand and gravel (false bedding) with thin layers of 
blue or brown clay — fossiliferous 18 
7. Blue clay (till) with striated boulders 3 
8. Hudson River stales 30 
141 
The Hudson River shales, which are quarried to make dark 
red pressed brick, rise about 30 feet above the Don, here prac- 
tically at the level of lake Ontario ; and are covered with a 
thin layer of typical boulder-clay containing finely polished 
and scratched fragments of the under-lying Cambro- Silurian 
rocks with a few stones of Laurentian origin. The residue of 
the clay after washing discloses particles of quartz, horn- 
blende, feldspar, etc., evidently derived from Archaean rocks. 
From the upper portion of the clay, which is indistinctly 
stratified, I have obtained Unios and the specimens of wood 
submitted to Prof. Penhallow. The Unios had evidently 
lived in the place where they were found, since they were not 
at all waterworn, still preserved their dark epidermis and fre- 
quently had the two valves attached. The till fills up all in- 
equalities in the previously eroded surface and forms a floor 
with a gentle southward slope under the whole city. To the 
south it passes beneath the surface of the lake at some points. 
I am informed by Mr. B. E. Walker that in excavating for 
the foundations of the Board of Trade building a few years 
ago two shark's teeth, apparently of Tertiary age, were found 
in the till. One of them is now in his possession. It is hard 
to account for this find, since no Tertiary rocks are known to 
exist this side of Hudson's bay. Some small outlier may lie 
hidden under the drift or may have been completely swept 
away by ice action. 
