A. E. Verrill — The Bermuda Islands,. 



473 



" Pulpit Rock," on Ireland Island, is a good example of a detached 

 pinnacle rock. (See figure 25.) It also shows well the irregular 

 stratification of the seolian limestone. Some of these pinnacles stand 

 out some distance from the shore, on the flat reefs, showing where 

 an islet, or the shore cliff once stood, long ago. 



Figure 25. — Pulpit Kock, Ireland Island. 



The famous North Rocks (figure 30) are pinnacles of this kind, 

 standing on the outer reef, some eight miles from the north side of 

 the islands. They stand on a broad platform of reef rock. They 

 serve as monuments to mark the position of what was once a large 

 and high island. (See Part III, ch. 23, and Geology.) 



In other cases, owing to the unequal hardness of the rock, and to 

 the frequent existence of masses of unconsolidated sand in the lime- 

 stone, the waves have eaten away these softer parts very rapidly, 

 leaving the harder parts standing. 



This has sometimes resulted in the formation of natural arches or 

 bridges, of which the double " natural arch " near Tucker's Town is a 

 good example. (See plate lxxxvii.) 



9. — Cathedral Hocks. 



The Cathedral Rocks, or "Old Church Rocks" as they are often 

 called, on the west side of Somerset Island, have been formed in a 



