on the Evidences of Glaciers in Scotland and England. 577 



adjacent to Lawers House, near Comrie, hard slaty rocks of the Devo- 

 nian or old red sandstone system have been rounded and striated. At 

 the west end of Comrie, near the bridge, blue slate rocks have been 

 also rounded and guttered. 



Evidence of Glaciers near Comrie. — In this district Dr. Buckland 

 tested the value of the glacial theory by marking in anticipation on 

 a map the localities where there ought to be evidences of glaciers 

 having existed, if the theory were founded on correct principles. 

 The results coincided with the anticipations. On a hill above the 

 gorge, called the Devil's Caldron, near Fentallich, are rounded 

 surfaces of greenstone, partially covered by moraines ; and at Kena- 

 gart, also immediately above the Devil's Caldron, is a small cluster 

 of moraines, easily separable into lateral and terminal. Two miles 

 up the valley a medial moraine forms a ridge on the level ground, in 

 front of the confluence of Glen Lednochand Glen Garron. The farm- 

 house of Invergeldy is stated to stand on the detritus of a moraine, 

 and the glen descending to it from Ben-na-cho-ny to be partially 

 obstructed with moraines. The surface of the granite at Invergeldy, 

 which supi)lied the stone for Lord Melville's monument at Criefi", is 

 rounded and mammillated, but too much weathered to present a 

 polish or strife. On a hill of trap, however, half a mile south of the 

 farm of Lurg, there is a distinct polish, striated in the direction 

 which a glacier descending the subjacent valley would assume. In 

 Glen Turret, on the shoulder of the mountain immediately above the 

 south-west extremity of Loch Turret, a very deep ravine intersects 

 a vast lateral moraine, which Dr. Buckland shows must have been 

 lodged there whilst the Loch was a mass of ice, and the valley above 

 it filled with a glacier more than five hundred feet above the present 

 level of the lake. At the falls of the Turret, at the lower extremity 

 of the gorge, is an extensive lodgement of moraines ; and at the 

 upper end, on the left bank of the Turret, near a gate which crosses 

 the road, the slate-rocks are polished and furrowed; and at both 

 these localities Dr. Buckland had anticipated that glacial action 

 ought to be found. 



Evidence of Glaciers near Loch Earn. — On the north bank of the 

 Loch rounded and furrowed surfaces and portions of lateral mo- 

 raines are exposed by the roadside ; and at Loch Earn Head is a 

 group of conical moraines at the junction of Glen Ogle with Loch 

 Earn, and at the very point where, had they been brought by a rapid 

 current, they would have been propelled into the Loch. It is never- 

 theless the exact position where the terminal moraine of a glacier 

 would be dejjosited. 



Moraines near Cullender. — Moraines are stated to cover more or 

 less the valley of the Teith from Loch Katherine to Callender, and 

 the lofty terraces flanking the valley from Callender to Douuc are 

 considered to l)e the detritus of moraines, modified by the great 

 floods which accomi)auied the melting of the ice. One of them, near 

 Callender, has Ijeen mapjjcd as the vallum of a Roman camp. Tlie 

 little lakes on tlie right bank of the Teith, four miles east of Cal- 

 lender, Dr. Buckland considers due to moraines obstructing the 



Phil. Mag. S. 3. Vol. 18. No. 120. Suppl. July 1841. •_> P 



