. Bulletin of the Geological Society of America. Geology. 172 A. P. COLEMAN LAKE IROQUOIS AT TORONTO ably 50 or 60 feet, above the present lake, but not more, since at this level in the Don beds the warm climate fossils cease, and just below it a series of sand and gravel beds containing much brown oxide of iron hint at shal- low water and oxidation. It may be added that the finding of unios in the position where they lived, just over the boulder clay, 35 feet above lake Ontario, suggests the same thing, as they are stated to live in shallow water only. This lake, 50 or 60 feet deeper than the
. Bulletin of the Geological Society of America. Geology. 172 A. P. COLEMAN LAKE IROQUOIS AT TORONTO ably 50 or 60 feet, above the present lake, but not more, since at this level in the Don beds the warm climate fossils cease, and just below it a series of sand and gravel beds containing much brown oxide of iron hint at shal- low water and oxidation. It may be added that the finding of unios in the position where they lived, just over the boulder clay, 35 feet above lake Ontario, suggests the same thing, as they are stated to live in shallow water only. This lake, 50 or 60 feet deeper than the present Ontario, could not have been dammed by ice during the genial Don climate, but may have been held up by a drift deposit near its eastern end, though more probably supported by a more extensive differential uplift near the Thousand islands than the one which holds up lake Ontario at present. Without any apparent discordance the warm climate beds are followed by a great thickness of buff stratified clay containing many thin peaty. stratined CLay Figure 4.—Section at Scarbm'o Hights. Ia3^ers with extinct insects and plant remains of a comparatively cool but not arctic climate, as shown by Dr Scudder, Professor Penhallow, Dr Macoun, and others.* The latter may be called the Scarboro beds of the Toronto formation, since best shown at Scarboro hights. At this* time, and probably during the preceding Don stage, a great river, the successor of Spencer's preglacial Laurentian river, drained the upper lakes, flowing from the Georgian bay to a point north of Toronto, where it formed an extensive delta deposit, now best displayed at Scarboro hights. The Scarboro peaty claj^s rise on the shore of lake Ontario, 95 feet above the * See papers previously Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geo
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