. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. LAKE MARGINS. BOGS AND PEATV SWAMPS. 35 Fig. 8.—Coverings o/Diatomacene from Rtunt Fresh-water Deposits, Nova Scotia,— 9!mm^^ Lake Margins in Nova Scotia are of some geological interest, from the effects of ice-pressure which they exhibit. Tlie expansion of the thic
. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. LAKE MARGINS. BOGS AND PEATV SWAMPS. 35 Fig. 8.—Coverings o/Diatomacene from Rtunt Fresh-water Deposits, Nova Scotia,— 9!mm^^ Lake Margins in Nova Scotia are of some geological interest, from the effects of ice-pressure which they exhibit. Tlie expansion of the thick icy sheet which forms on the surface of our lakes in winter, and its drifting to and fro when loosened from the shores by the thaws of spring, heap up very remarkable ridges and embank- ments of stones, gravel, and earth. In low and muddy shores, these actions of the ice, I believe principally the latter, push up long mounds, which look as if an attempt had been made to raise an artificial dike; and where the shores consist of small stones and gravel, still more regular structures are sometimes produced. Oc- casionally there are two mounds, one within the other, marking different levels of the water; and I have seen these mounds still remaining, in places wdiere lakes and ponds had been long since filled up and converted into bogs. On rocky shores, large stones are pushed against the bank and packed together until they form huge sloping Cyclopean Avails, which testify not only by their mass, but by the manner in Avhich they have been wedged together, to the force that has been applied to them. This last appearance is as well seen in some of the upper lakes of the Shubenacadie as in any others that I have examined. These modern effects of ice-pressure will serve to explain some of the phenomena of the drift or boulder fomiation which overspreads the surface of the province. They are also curious from the resemblance which they bear to glacier moraines, for which they might
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