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The notable controversy in the discussion is whether the cirques were formed before the Wisconsinan epoch or afterwards. Billings and Goldthwait concluded that there was a major period of local glaciation before the continental ice inundated the White Mountains. Their conclusion is based on several observations including (1) the absence of terminal moraines. A more technical and much more controversial note (2) is the question of “drift’. Drift is a general term for the rock debris left by the glaciers and Goldthwait (and other geologists) carefully cataloged drift found in the cirques on the northern slope, in king’s Ravine for instance, and determined that it came from a few miles north of the mountains and was deposited there by the Wisconsinan ice sheet after local glaciation ceased. Goldthwait (1970) makes several more points in his argument for the theory that the local glaciers created the alpine cirques before the arrival of last continental ice sheet that you can read in his paper. I won’t include them here.
1 comment:
Jual Obat Aborsi,
Jual Obat Aborsi,
Obat Aborsi
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