ox THK GEOLOGY OF BARBADOS. 221 



over any continuous reefs along the border of the Scotland District, 

 thougli small ])atches of reef-rock appear to have been formed in 

 some places, and large blocks of them are now found on the recent 

 beach. 



Isolated rocks and outlying patches of coral-limestone occur liere 

 and there over the Scotland District at various levels below 500 feet, 

 but mostly between 300 and 400. Some of the rocks that lie at no 

 great distance from the main escarpment may have slii)ped from 

 thence ; others, however, occur in such positions that they could 

 not possibly have been so derived, but must have been formed where 

 they are now found. They generally occupy the tops or lie on one 

 side of small hills, and are sometimes separated from the escarp- 

 ment by a broad valley. A mass of very hard and white rock as 

 large as a negro's cabin lies on the surface at Vaughan's estate at 

 a level of over TOO feet, and a specimen taken from it i)roves to be 

 an Ampliistegina-vook (described in Mr. Hill's 1st appendix to this 

 paper). A large patch of reef-rock occurs on the top of the hill at 

 Bawdcns in St. Andrew's parish ; this hill is 389 feet high, is a 

 mile to the east of the main escarpment, and separated from it by a 

 wide and deep valley. The highest patch we found is at Lower 

 Turner's Hall, at an elevation of 462 feet, this place being rather 

 more than half a mile south of Eawdeiis. There are also large 

 blocks of coral below Cherry-Tree Hill at a level of about 450 feet. 



At Boscobelle, in the northernmost part of the Scotland District 

 and about 200 feet above the sea, there is a patch of coral-rock 

 occupying about 15 acres : and farther north, between Boscobelle 

 and Pico Teneriffe, there is a platform of the same rock cliLging to 

 the seaward side of the Scotland sandstones, with a low escarpment 

 on the west side, reproducing the features of the platform at 

 St. Mark's described on p. 218, except that it has been cut through 

 by the sea at Grant's Bay, south of Pico Tonerifle, and is, therefore, 

 in reality an outlier. 



The extreme N.E. part of the island is difficult of access, but we 

 ascertained that it was everywhere covered by coral-rock, except in 

 a few places where the older formations are exposed. The nature 

 of the rock which occurs here below the level of 200 feet is different 

 from the coral-rock of the south. It appears to consist chiefly of 

 broken lumps and blocks of coral-limestone which have been re- 

 cemented by calcareous matter, and the surface is nearly level as if 

 it were a plain of marine denudation. This difference is doubtless 

 connected with the fact that a powerful surf beats on the present 

 coast, excavating huge caverns in the cliffs, which as a rule in this 

 district rise sheer from the sea. 



(f ) The Christclmrch Ridge. — This ridge was mentioned on p. 209, 

 but is worthy of a little further description because it appears to 

 consist of an entirely independent set of reefs, and to have an 

 independent basis or foundation. 



As limited by the 2U0-feet contour this tract is about eight miles 

 long, and the portion above 250 feet has a length of about six 

 miles. The ground rises in a series of terraces up to a set of narrow 



Q.J.G.S. Xo. 186. Q 



