. The Quarterly journal of the Geological Society of London. [Scales : horizontal, 4 inches = 1 mile ; vertical, 1 inch = 660 feet.]a = The gorge. b = 430-foot plain. c = 750-foot plain. Fig. 3.—Section at Trevalga Mill, at a spot on fig. 1 abouthalf a mile east-north-east of St. Nectans Kieve. ?700 [Scales : horizontal, 4 inches = 1 mile; vertical, 1 inch = 660 feet.]a = Present valley. B = 430-foot plain. C = 750-foot plain. The basin is breached by a hole in its side, through which thewaters escape and form a second small waterfall, while remnants ofothers scar the walls of the gorge,
. The Quarterly journal of the Geological Society of London. [Scales : horizontal, 4 inches = 1 mile ; vertical, 1 inch = 660 feet.]a = The gorge. b = 430-foot plain. c = 750-foot plain. Fig. 3.—Section at Trevalga Mill, at a spot on fig. 1 abouthalf a mile east-north-east of St. Nectans Kieve. ?700 [Scales : horizontal, 4 inches = 1 mile; vertical, 1 inch = 660 feet.]a = Present valley. B = 430-foot plain. C = 750-foot plain. The basin is breached by a hole in its side, through which thewaters escape and form a second small waterfall, while remnants ofothers scar the walls of the gorge, here about 100 feet wide. Thestream then races among rocks through the deep ravine for severalmiles, and thereafter forms a series of cascades and waterfalls,swirling among potholes, until it reaches the sea. The sides of thegorge, which is justly famed for its great charm and beauty, areeverywhere nearly vertical, huge crags and bluffs overhanging inmany parts. part 1] EIVEE-GOEGES IN COENWALL AND DEVON. 69 The accompanying sections (figs. 2 & 3, p. 68) show in profilethe way in which the fall has ripped out a chasm in the plateauand also where it has cut a sharp V-shaped recent valley in itsancient wider one. The country-rock is intensely metamorphosedsericite-phyllite, which everywhere wea
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
