OUTLINES OF GEOLOGY. 



37 



calcareous rock, are, as it were, studded to heights of 1500 

 feet above the valley beneath, with blocks of stone. Some 

 of these are of enormous size, say 40 feet in height and 20 

 in diameter. They are of the same character with the rocks 

 of the chain of Alps, which bounds the valley of Switzerland 

 on the opposite side. 



2. The sandy plains of Northern Germany, Prussia, Po- 

 land, and Livonia, from the mouth of the Emms to the Neva, 

 are also studded with erratic blocks. These are of rocks 

 found in place . in the Scandinavian mountains. The same 

 is the case in Holstein and Jutland, and similar blocks are 

 found in greater abundance in the southern provinces of Swe- 

 deno and in Finland. 



3. A great part of the counties of Norfolk and Suffolk, 

 and the summits of the hills of Derbyshire, in England, ex- 

 hibit erratic blocks like those of Germany ; some of these 

 are of rocks found in Westmoreland and Cumberland ; but 

 the greater part are more similar to those of the Grampian 

 and Scandinavian mountains. 



4. The island of Iceland, which is wholly volcanic, exhib- 

 its in many places great blocks of granite. 



5. Granite boulders are found on the Andes, at a great 

 distance from any native locality of that rock. 



6. At Hyderabad, in India, there are great heaps of gran- 

 ite rocks, also at a great distance from any position where 

 that rock is found in place. 



7. On the site of the city of New- York, and on the north 

 side of Long Island, numerous large boulders are found, not 

 only superficial but imbedded in diluvial gravel. The most 

 remarkable of these was twenty feet in length by fifteen in 

 diameter, and was of the same rock with Schooley's Moun- 

 tain, at a distance of 40 miles in New- Jersey. The passage 

 of such blocks from their original localities is said to have 

 left deep grooves in the formations over which they must have 



4 



