Tnterglacial Fossils. — Coleman, si) 
Above the till we find IS feet of sand with some fine gravel 
and a few thin la} T ers of clay, a deposit formed in shallow 
water with shifting currents as shown by the false bedding. 
Well rounded pebbles of Laurentian and Silurian rocks occur, 
and the sands contain fragments of most of the minerals be- 
longing to Archaean rocks. Some layers are brown from a 
deposit of hydrous sesquioxide of iron. Shells of Pleurocera 
and Sphaerium are common throughout the sand, and about 
eight feet above the till there is a layer containing many 
Unios, mostly separate valves more or less waterworn. 
Above the sand is a bed of blue calcareous clay with Hakes 
of peaty matter, then a bed of unfossiliferuus sand, followed 
by a thick bed of distinctly jointed brownish clay, making 
red brick, probably corresponding to the Erie clay described 
in the Geological Survey Report for 1863. 
This is succeeded by 69 feet of finel} T stratified bluish grej" 
clay too calcareous for brick-making in the lower portions but 
yielding a buff brick from the upper layers. Very few peb- 
bles or stones occur in it. the few that I have found being sub- 
angular with some faces polished and others rough. Under 
the microscope it appears to be a fine "rock flour" containing 
a few minute angular fragments of quartz, orthoclase, micro- 
cline, etc., as well as many indeterminable particles. 
Towards the top this clay merges into an unstratified 
brownish clay with many boulders of Silurian and Laurentian 
origin, some fairly well rounded, others subangular and more 
or less striated. The line between the brown clay and the 
overlying sandy soil also is not well marked. In the soil and 
on the surface are many large Archaean boulders, one mass of 
gneiss measuring nearly six feet in longest diameter. The 
top of the section. 140 feet above the Don. is at the level of 
the plain on which the northern part of Toronto is built, a 
plain extending several miles to the westward, but cut off a 
quarter of a mile to the north by the Davenport ridge. Se\ 
eral other exposures along the Don and its tributaries or at 
railway cuttings in the neighborhood show similar sections of 
stratified sands and clays, but. as far as observed, without fos- 
sils. The upper boulder deposit is better displayed at the 
end of the C. I'. H. trestle, a quarter of a mile to the south, 
than at the quarry itself. Here ten or fifteen feet of sandy 
