Page:The Journal of geology (IA journalofgeology21894univers).pdf/108
dunes; the beautiful group of radial rivers, flowing down the slopes of a great alluvial fan that has been formed where several large rivers emerge from the Pyrenees, this being one of the best examples of a simple consequent river-grouping that I have found; the plateau of the lower Seine, an old upland of denudation, with an excellent meandering river gorge of moderate depth cut through it, together with certain interesting features of young branching river valleys, and of rivers that have been shortened by the encroachments of the sea in cutting away the land. To these I intend shortly to add groups of sheets showing the dissected escarpment west of Rheims and Chalons, with its beautifully adjusted rivers, the delta of the Rhone, and the fiorded coast of Brittany.
From the Ordnance Survey of Great Britain (1:63,360) one set of sheets includes the central Highlands of Scotland, with the Great Glen and Glen Roy; two other sets include the fiords and islands of the southwestern and the northwestern coasts. These three sets agree in showing an old peneplain of denudation, then elevated and maturely dissected, and now somewhat depressed, with cliffs nipped on its land heads and deltas laid in its bay heads. Their formula, according to the plan already suggested, would be 75, + 25, - 2. A glacial accident of late date is recorded by the upland tarns and the valley lakes. A group of sheets for southwestern Ireland exhibits bold mountain ranges running directly into the sea, forming a strongly serrated coast. The English sheets are of older date and are not of particularly good expression, and for this reason I have not yet ordered any of them; although the ragged escarpment of the chalk and of the oölite trending northeast on either side of Oxford should be represented; and the Weald offers excellent illustration of well adjusted consequent and subsequent rivers on an unroofed dome of Cretaceous strata.
The map of the German Empire (1:100,000) supplies many examples of striking features. The plateau of the Middle Rhine has already been mentioned as a subject for lantern slides; it is represented in two map-groups, one of which shows the transverse