290 A. P. COLEMAN 



feet higher than Ontario. If this is correct there had already 

 been a damming back of the interglacial waters to a higher 

 level than has been reached yet in postglacial times. This 

 damming could not have been by ice, for the climate was at 

 least as mild as at present, since the tree trunks referred to 

 include wood of the red cedar, an elm, the pawpaw and three 

 species of oak ; and among the shellfish there are two not 

 reported from Canadian waters at the present day, though 

 found in the Mississippi, Quadrula (unio) pyramidata and 

 Anodonta grandis. 1 



As the beds at Taylor's brickyard, which have been des- 

 cribed in former papers, have been traced as far east as the bend 

 of the Don at the edge of the interglacial valley just referred 

 to and also as a thin lower layer across these deposits, we 

 may include the whole in one section, commencing with the 

 bend of the Don as a basal series and running up through the 

 series at the brickyard as far as the cold climate stratified 

 clays. 



SECTION AT TAYLOR'S BRICKYARD 



Feet 



8. Yellow or brown sand with some reddish clay (no fossils) - 3-60^ 



7. Blue peat}' clay with some gray sand (unios, wood, caribou 



horn) 4^_ 57 ^ 



6. Yellow to brown sand with thin layers of purplish clay 



(shells) .... I4 _ 53 



5. Fine gray and yellow sand (unios and other shells) - - 3-39 



4. Blue stratified clay and sand (unios with other shells and logs 

 of wood), above 2% feet of bowlder clay resting on Hudson 

 River shale ---------- 2-36 



SECTION AT BEND OF DON 



3. Brown clay with sandy layers (unios, campeloma, etc.) - - 5-34 



2. Blue clay with sandy layers (unios, anodons, wood) - - - 6-29 



1 . Coarse shingle with clay and peaty layers (shells and logs) - 4-23 



River Don above Lake Ontario ------ 19-19 



From the combined section given above it will be seen that 

 the warm climate beds of the Don commencing 19 feet above 

 Lake Ontario have a total thickness of 41^ feet. It should be 



'Notes on Can. Unionidae, J. F. Whiteaves, Can. Rec. Science, 1895, No. 5, p. 

 250 ; and No. 6, p. 365. 



