Vol. 63.^ THE CORAL-ROCKS OF BARBADOS. 325 



last exposure beds are seen inclined 3° to the south-south-east, lying 

 on others dipping at 15° south-eastward ; and succeeded by beds 

 sloping to the north-east at angles of about 25°. Farther north- 

 west beds dip at 32° east-south-eastward, and this high inclination 

 gradually changes in the course of about 50 yards to one of 3° 

 south-eastward. At the north-western end of the series of sections 

 beds are exposed dipping at 15° south-eastward, followed by beds 

 which slope at 4° in the same direction. (See fig. 9, p. 326.) 

 All the dips in this series of exposures are clearly due to current- 

 bedding, and are excellent examples of the effects of currents, 

 varying in direction and in force, on calcareous sands and marly 

 coral-debris in shallow water outside the coast-line — then formed 

 by what is now the neighbouring great escarpment. 



About 1| miles east of the Bushy-Park road, at Mapp's Planta- 

 tion, is an old quarry. On the eastern face at its northern end the 

 upper strata dip at 15° south-eastward and rest on horizontal beds, 

 the upper beds towards the southern end gradually losing their slope 

 and becoming horizontal. On the western face the lowest beds seen 

 dip at an angle of 3° southward, and are succeeded at the northern 

 end by beds dipping at 25° in the same direction ; while the upper- 

 most beds near the middle of the face dip at 5° south-south-eastward, 

 and become horizontal towards the southern end. On the northern 

 face at its eastern end the strata dip westward, the lower at 8°, the 

 higher at 18° ; while towards the western end the lower beds become 

 horizontal, and the slope of the upper gradually increases to 28°. 

 All the beds are of similar character, consisting of ' Beach-rock,' 

 and their inclinations are due to current-action. (See fig. 10, p. 326.) 

 Thus the exposures along the alleged strike of the dipping-beds give 

 no support to Prof. Spencer's statement. 



About lg miles in a southerly direction fromMapp's, at Rolston, 

 is a road-cutting in which dipping-beds are exposed. The section, 

 is from the north-west to the south-east, and at the northern end 

 the approximately-horizontal beds which are seen between Mapp's 

 and Eolston are succeeded by beds of fine marl dipping under them 

 at 5° north-north-eastward. These extend for about 50 yards, and 

 then are underlain by beds of exceedingly-coarse limestone-con- 

 glomerate, containing masses of limestone measuring up to 12 inches 

 across, dipping in the same direction at 30°. The conglomerate-beds 

 are from 5 to 6 feet thick, and in turn are followed towards the 

 south-east of the section by beds of friable marly limestones inclined 

 at 5° to the east-north-easr. 



The true dips of the coral-rock in this district are very clearly 

 seen in the numerous cliff-faces between Long Bay and Ragged 

 Point. The cliffs range from 20 to 40 feet in height, and the beds 

 shown in them are, as a rule, practically horizontal, but in places 

 dip from 1° to 3° to either the west, the west-south-west, the 

 north-north-west, or the south-east. Beds in situ dipping at angles 

 of from 12° to 20° south-eastward were not seen in any place 

 that I examined; but near The Crane I found great fallen or 



