Page:Polar Exploration - Bruce - 1911.djvu/196

192 two to three cwts. The distribution, in the Weddell and Biscoe Seas of these great boulders, which show glacial erosion in having had their corners ground off, indicates that they have doubtless been carried out to the deep water of the Weddell Sea at the bottom of great icebergs that once formed part of, and have been calved from the great ice-sheet that probably flows northward from the South Pole over the Antarctic continent and finally break off at ice-faces bounding the Weddell and Biscoe Seas. Nothing would be more tempting than to discuss at greater length these deep-sea deposits, but that must be done at another time and in another place. Meantime the important feature to remember is the diatom ooze at the bottom of the Antarctic and subantarctic seas and the blue muds in the vicinity of all known Antarctic lands, indicating a greater extension of those lands and the existence of a great Antarctic Continent, further proof of which has already been given.