ON THE GEOLOGY OF BARBADOS. 211 



for the much higher dips found at the south than at the north end 

 of the hill, and it is very probable that the axis of the trough is in- 

 clined southward, which will explain the southeruing in the E.S.E. 

 and S.S.E. dips. 



Fig. 4. — Section through Mount Hillahy. 

 S.W. ]v^.E. 



[Distance : one mile.] 



a. Scotland Beds. c. Coral-rock. 



b. Oceanic Beds. F. Faults. 



Cleland and Farley Hill. — We did not find any good sections in 

 the district below Spring Head or near Sedge Pond ; but an excel- 

 lent section is exposed in the next area, along the road which leads 

 by Cleland to Farley Hill. South of Cleland, and at a place known 

 as Cockcrow Eock, the base of the Oceanic Deposits can be seen 

 resting on the Scotland Sandstones and consisting of a hard, splintery 

 white limestone with a roughly conchoidal fracture; this bed is 

 12 to 15 inches thick, and is succeeded by a hard white chalky rock, 

 which is about 5 feet thick and contains nearly QQ per cent, of 

 carbonate of lime. Above this are 20 to 30 feet of calcareo- 

 siliceous earth, and then thick beds of siliceous radiolarian earth. 

 Near the top of the hill calcareous beds come in again, as at Mount 

 Hillaby, the highest 10 feet consisting of some of the purest chalk 

 in the island, samples of white chalk from here containing about 80 

 per cent, of carbonate of lime and enclosing many foraminifera. 

 These beds are found just below the coral-rock. The total thickness 

 is probably over 200 feet. 



The dip near Cleland and Bredy's seems to be to the S.E., and 

 consequently the base or boundary-line rises northward from 

 Bredy's estate, where it is at about 300 feet, to a high level under 

 Cherry Tree Hill. At the latter place the lower- calcareous beds 

 can be seen resting on Scotland Beds and dipping to the north- 

 east ; from the base of these to that of the coral-rock above the 

 total thickness is not more than 40 feet, and a little farther north 

 the Oceanic Beds disappear entirely beneath the coral escarpment, 

 which then rests on Scotland Beds. 



Grant^s Bay. — North-east of St. Philip's Church the Oceanic Beds 

 are brought in again by a fault, and extend thence to Grant's Bay, 

 on the coast just south of the point called Pico Teneriffe. Schom- 

 burgk correctly states that this promontory consists of the ' Infusorial 

 Earth,' but he does not mention its highly calcareous and chalky 

 nature, the proportion of calcium carbonate in the lower beds being 

 73 per cent. These pass up into more siliceous earths, and about 



