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Several centuries ago immense quantities of this lighter material were washed down from the higher slopes by a flood of extraordinary magnitude, caused probably by the sudden melting of the ice and snow during an eruption, giving rise to the deposition of conspicuous delta-like beds around the base.
Squitty Island lies in the Gulf of Georgia midway between a mainland made of mountains like the Alps, the Andes, and the Himalayas all jumbled together and all rising sheer from the sea, and the low delta-like shore of Vancouver Island.
"As you are aware, no general survey of Florida has yet been made; there exist no maps of the Everglades south of Okeechobee; even Little Sprite Lake is but a vague blot on our maps. We know, of course, that south of the eleven thousand square miles of fresh water which is called Lake Okeechobee the Everglades form a vast, delta-like projection of thousands and thousands of square miles.
Magnificent floods from the ample fountains of ice and snow working with sublime energy upon this prepared glacial detritus, sorted it out and carried down immense quantities from the higher slopes, and reformed it in smooth, delta-like beds around the base; and it is these flood-beds joined together that now form the main honey-zone of the old volcano.
At the level of the lower shelf in Glen Roy, at points where torrents now cut channels through the shelf as they descend the hill-side, there are small delta-like extensions of the shelf, perfectly preserved, as if the materials, whether fine or coarse, had originally settled there in a placid lake, and had not been acted upon by tidal currents, mingling them with the sediment of other streams.
If the Menchecourt beds had been first formed, and the valley, after being nearly as deep and wide as it is now, had subsided, the sea must have advanced inland, causing small delta-like accumulations at successive heights, wherever the main river and its tributaries met the sea.
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