264 PROCEEDINGS OF THE COTTESWOLD CLUB 



merely magnetic, i.e., attracted by a magnet, but (perhaps 

 in consequence of the N. and S. direction of the 

 mountain) permanently magnetised ; an enormous " lode- 

 stone," in fact. 



[Action of the specimen on a compass needle demonstrated.] 



2. — The Buttes, and the sandstone pillars in Weber 

 Canon, near Ogden : curious examples of sub-aerial 

 denudation. Buttes are flat-topped, table-like masses, 

 usually of sandstone, which stand out above the level of 

 the prairie plain, all the softer materials around them 

 having been eroded away. 



A similar selective erosion has taken place on a smaller 

 scale along the sides of Weber Caiion. In several places 

 there jut out tall, rounded, tower-like columns and 

 pinnacles of bright-coloured red sandstone, which at a 

 short distance off are hardly to be distinguished from the 

 ruins of old castles. I need scarcely remind you of the 

 precisely analogous examples of denudation in the carbon- 

 iferous limestone, observable in "The Seven Sisters" and 

 other rocks near Symond's Yat. 



3. — The " Devil's Shdes" in Echo Canon ; — two enor- 

 mous parallel dykes of granite, about 10 feet apart, standing 

 out like walls 20 feet high from the side of the caiion ; 

 their destruction having been given up by Nature as a 

 hopeless task when she carved out the deep valley in the 

 solid, but softer sandstone. 



4. — The series of parallel, horizontal terraces, which 

 are traceable all round the basin of the Great Salt Lake, 

 and which are exactly analogous in appearance and origin 

 to the well-known " Parallel Roads of Glen Roy" near Ben 

 Nevis. The highest of them is nearly 1,000 feet above 

 the present lake, and is found to correspond exactly in 

 level with a gap in the northern boundary of the basin, 

 through which the water of the lake must at one time 

 have found an outlet into the Snake River. At this period 



