328 PKOF. J. B. HARRISON ON" [Aug. I907,. 



there are local dips at low angles. About 60 feet of talus-slope 

 lies below this terrace, and at some 520 feet above sea-level is a 

 small limestone-plateau, the rock lying horizontally and uncon- 

 formably upon beds of the Oceanic Series. The basal part of this 

 plateau is indistinguishable in structure from Prof. Spencer's ' Bath 

 Formation.' 



The limestone-beds seen in the escarpment to the north of the 

 Newcastle road either are horizontal, or lie at low inclinations : as, 

 for instance, at Hackleston's Cliff, where they dip south-westward 

 at an angle of about 2°. 



If the cliffs between St. John's Church and the Newcastle road 

 are viewed from a little distance, well-marked inclinations are seen 

 in some of what appear from afar to be cliff-faces. For instance, a 

 little north of the church the beds seen in a bluff are inclined to 

 about 10° south of west at an angle of 23°; and about 400 yards to 

 the north a great mass has an apparent dip of 18° westward, while 

 some 200 yards still farther north in another mass beds are inclined 

 25° west-south-westward. These inclinations are due to landslips, 

 and are found wherever masses of the escarpment have slid in 

 various directions over sloping surfaces of the underlying Oceanic 

 marls and clays. The existence of these masses was pointed out by 

 Schomburgk in 1848. Masses showing highly-inclined beds near 

 to and south of the church are known to have slipped from the 

 horizontally-bedded limestone-plateau some fifty years ago — with the 

 result of obliterating a spring of water which issued from near the 

 base of the escarpment, and from which the then inhabitants of the 

 neighbourhood obtained their water-supply. These facts are of 

 importance, as they supply reasonable grounds for thinking that 

 the bluffs near Conset Point also owe the inclined nature of their 

 bedding, in part at least, to landslips. 



The 800- and 1000-foot Plateaus. 



Prof. Spencer laid stress on the presence of limestone-beds dipping 

 at 12° to 20° south-eastward on the estates of Chimborazo, Cane- 

 field, and Mount Misery, and I therefore made careful examinations 

 of the various sections in the 800- and 1000-foot plateaus. In 

 two places near the edge of the 800-foot escarpment, beds dipping 

 at considerable angles were found. 



The more westerly one of these is at Dukes, about 2 miles north 

 of Cane Garden, at an elevation of about 800 feet. The section is 

 known as ' Dukes' Marl-hole.' The highest beds exposed towards 

 the southern end of the pit are horizontal, and are underlain by 

 beds sloping at 12° north-westward ; under these are others 

 dipping 17° west-south-westward, while the lowest beds seen dip 

 28° in the same direction. The upper beds on the north of the 

 marl-hole are horizontal, as are the lower : but the latter gradually 

 slope, until they are inclined at 12° to the south. All these beds 

 consist of calcareous rubbly marl. 



Between Mount-Tabor Boad and Villa-Nova Road, about 5 miles 



