CANYONS OF THE PACIFIC OCEAN
Off the Southern Californian coast where it slopes steeply to the depths of the sea are; huge submarine canyons not unlike the 1 great Canyon of Colorado on the land. Some are 3000 feet deep and have deltas like a river. They have been lately described by Mr Francis Shephard, the oceanographer, who points out the mystery of their origin and maintenance. These' ocean canyons are free from mud for the greater of their length, but this is not due to tides but to oceanic eddies which sweep through them and keep them from silting up with sand. Only when the canyon touches tfctf coast does mud appear, sometimes ten feet deep, but the rest of the deep cubting lias a bottom of rounded gravel. The. only likfely suggeestion about their origin is that once they were river cuttings on the land, and have sunk to their present level by the slow change in the height of the continental surface on its western front. Other signs of this sinking have been noted.
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https://paperspast.natlib.govt.nz/newspapers/BPB19410113.2.31
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Bay of Plenty Beacon, Volume 3, Issue 257, 13 January 1941, Page 5
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177CANYONS OF THE PACIFIC OCEAN Bay of Plenty Beacon, Volume 3, Issue 257, 13 January 1941, Page 5
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