Note 268 — Chapter XVI
Reading edition
“As to the polishing and grooving of hard rocks, it has lately been ascertained that glaciers give rise to these effects when pushing forward sand, pebbles, and rocky fragments, and causing them to grate along the bottom. Nor can there be any doubt that icebergs, when they run aground on the floor of the ocean, imprint similar marks upon it.”—Principles of Geology, or the modern changes of the Earth and its Inhabitants considered as illustrative of Geology: by Charles Lyell, M.A., F.R.S. Travels through the Alps of Savoy, and other parts of the Pennine Chain, with Observations on the Phenomena of Glaciers: by James D. Forbes, F.R.S.