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Updated: May 13, 2025
Sometimes these beds are only imperfect moutonnées, i.e., they are composed of broken angular surface with only the points and edges planed off. Now, moutonnées surfaces always, and especially angular surfaces with only points and edges beveled, show that the erosion by grinding has been only very superficial.
The ice sheet, grinding slowly over the hills and rocks, smoothed and polished and striated their surfaces in many places till they resembled the roches moutonnées similarly ground down in our own day by the moving ice rivers of Chamouni and Grindelwald.
He found true erratics loose pebbles, granite, gneiss, and granitic sandstone, having no resemblance to any native rock in the vicinity scattered over the whole surface of the hill to its very summit. The hill itself had also the character of the "roches moutonnees" modeled by ice in the northern hemisphere.
The rock islets that rise here and there, forming so marked a feature of the harbor, are unchanged roches moutonnees, and the shores are grooved, scratched, and rounded, and in every way as glacial in all their characteristics as those of a newborn glacial lake.
In a word, all bowlders, whether angular or rounded, are supposed to owe their origin or separation and shaping to glacial agency. Now, if such be the true view of glacial erosion, evidently its effect in mountain sculpture must be small indeed. Roches moutonnées are recognized by all as the most universal and characteristic sign of a glacial bed.
The characteristic traces left by the ice, as well known to him now as the track of the game to the hunter; the peculiar lines, furrows, and grooves; the polished surfaces, the roches moutonnees; the rocks, whether hard or soft, cut to one level, as by a rigid instrument; the unstratified drift and the distribution of loose material in relation to the ancient glacier beds, all agreed with what he already knew of glacial action.
Not badly said, but think again. Like like I know what it is like. Like the back of some great monster peeping up through the turf. You have got it. Such rocks as these are called in Switzerland "roches moutonnees," because they are, people fancy, like sheep's backs. Now look at the cracks and layers in it. They run across the stone; they have nothing to do with the shape of it. You see that?
ROCHES MOUTONNEES AND ROUNDED HILLS. The prominences left between the hollows due to plucking are commonly ground down and rounded on the stoss side, the side from which the ice advances, and sometimes on the opposite, the lee side, as well.
Beginning on the northwestern extremity of the group, I explored the chief tributary basins in succession, their moraines, roches moutonnées, and splendid glacier pavements, taking them in regular succession without any reference to the time consumed in their study.
This erratic n has a regularly rounded top, worn and smoothed like the "roches moutonnees" before mentioned, but no part of the attrition can have occurred since it left its parent rock, the angles of the lower portion being quite sharp and unblunted. a. Fragment detached from the same. c. Unstratified drift with boulders. d.
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