. The continent we live on. Physical geography; Natural history. .tt^- -^^isir-:. ^ T/ze Greaf B/we Heron, one of the commonest waders in the East, has a wing span as great as an eagle's. It winters in the South but individuals may stay about the Heartland all year round. great domed slab of most ancient and almost non-compressible rocks that spreads all across eastern Canada; the whole of the Quebec-Labrador Peninsula; the Gulf of ; New- foundland; Nova Scotia; and the whole of New England. To the west it spread over the Canadian Lakes District (see Chapter 3) from the Keewatin
. The continent we live on. Physical geography; Natural history. .tt^- -^^isir-:. ^ T/ze Greaf B/we Heron, one of the commonest waders in the East, has a wing span as great as an eagle's. It winters in the South but individuals may stay about the Heartland all year round. great domed slab of most ancient and almost non-compressible rocks that spreads all across eastern Canada; the whole of the Quebec-Labrador Peninsula; the Gulf of ; New- foundland; Nova Scotia; and the whole of New England. To the west it spread over the Canadian Lakes District (see Chapter 3) from the Keewatin Peninsula. A great part of this, notably the Laurentian Shield, Labrador, and the lands about the mouth of the St. Lawrence, did not sink to anything like the same extent as surrounding areas. The greatest sag was under Hudson Bay; the next greatest sag occurred in the area south of the Laurentian Shield over what is now known as the Great Lakes. Evidence that all this territory was once covered with ice is plain to see, once the things to look for have been pointed out by geologists. These may be divided into two lots; those produced on the land actually covered by the icecap, and those to be seen on lands beyond its farthest extension. The first is of two kinds: that produced while the icecap was growing and advancing, and that left as it retreated or melted away. Of course it is not yet certain whether the land slid in under a permanent polar icecap, whether the icecap crept south over the land, or whether it developed in situ. There was obviously a southward movement of ice, but this need not have been a gradually expanding cap 84. 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 Sanderson, Ivan Terence, 1911-1973. New York : Random House
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