ON THE GEOLOGr OF BaEBADOS. 203 



which are concealed beneath the newer limestones. Thus the 

 tract which borders the coral-rock from Sealy Hall to j^ewcastle 

 doubtless extends a long way westward beneath the coral-lime- 

 stones. The accuracy of this inference is proved by such well- 

 sections as we were able to obtain information about ; at Haynesfield, 

 two miles south-west of Newcastle, the well was carried into 

 radiolarian earth at about 150 feet, and a boring made for the 

 Water Supply Company near Lightfoot's proved 18 feet of the red 

 clays beneath the corals, and radiolarian earth below them. It is 

 probable, therefore, that nearly the whole of the coral-limestone 

 area in St. John's parish is underlain by Oceanic Deposits. They 

 also extend under the lower plateau by St. Mark's Church to Bay- 

 field and Sheete's Bay, where a small tract of them is exposed by 

 erosion. A little south of this there is another inlier by Three 

 Houses; and still farther south, on the borders of Christchurch parish, 

 between Hopefield and Loamfield, there is another inlying area ex- 

 posed by removal of the coral-rock. The probable structure of the 

 Christchurch ridge was illustrated by fig. 9 of the first part of this 

 memoir. 



Passing now to the northern part of the island, the occurrence of 

 radiolarian earths at Percy's Spring, and thence up the guUy to 

 Canefield, shows that a considerable mass of these deposits underlies 

 the coral-rock of that district. This mass is probably bounded on 

 the north by the Farmer's Gully fault, and on the east by a con- 

 tinuation of the Caledonia fault. 



How far the Spring and Sedge Pond area extends westward we 

 have no evidence, but since there is a westerly slope beneath the 

 coral-rocks and the Oceanic Beds dip to the S.E., the base of the 

 latter would probably be brought up within a short distance. A 

 boring at Bock Dundo, however, proved the existence of another 

 sublying area of Oceanic earths at a level of only 263 feet above 

 the sea (see Part I. fig. 6). 



With regard to the westerly extension of the Cleland area, we 

 have interesting evidence from information furnished to us by 

 Mr. E. Easton, C.E., as to borings made through the coral-rock 

 near Welsh Town. These disclosed the existence of a ridge of the 

 Scotland Clays close to the surface by Welsh Town, but sloping 

 steeply to the north-west beneath coral-rock which gets gradually 

 thicker till, near Alexandria, it is 150 feet deep, with the clays still 

 below it. South-eastward the Oceanic Deposits come in between 

 the clays and the coral-rock, as shown in fig. 1 (see next page). 



Most of the extreme northern end of the island seems to be 

 underlain by Scotland Clays and Sandstones, for these beds come 

 to the surface in two localities ; but along the north-eastern 

 coast there are several exposures of Oceanic Deposits, one round 

 Laycock Bay, two smaller ones near Lowland, another between 

 Islicot and River Bay, and finally a narrow strip on the coast north 

 of Cluff's.^ It is noteworthy that if the Boscobelle fault were pro- 

 longed north-westward to near Cluft''s all these exposures would lie 

 1 These places lie to the north of the area included in the Map facing p. 202. 



