Vol. 54.] THE GLOBIGEEINA-MAELS, ETC., OF BAEBADOS. 543 



of the island near Chimborazo, where the elevation reaches 1100 

 feet. Along this ridge a road is carried from Chimborazo to Bissex 

 Hill, and thence along the western slope of that hill. A branch of 

 this road climbs to the Police Station, which is built a little below 

 the summit of the hill, at the offset of an easterly spur. 



From the main road a branch runs in a north-easterly direc- 

 tion along the face of the southern rise of Bissex Hill, and near the 

 point where the roads diverge a fault occurs, which accounts for the 

 existence of an outlier of Oceanic Beds on Park's Estate at a level of 

 about 700 feet, while the base of the same beds in the roadway is 

 seen at about 800 feet. This fault {F. 1 on the accompanying map) 

 has an upthrow on the north side, and the Oceanic Beds seen along 

 the road dip locally at a high angle (45°), later at a low one of about 

 5° to the north-west, and extend up to a height of about 865 feet. 

 They are then succeeded for a short distance by Glohigerina-lim.e- 

 stone and marl, and again occur as siliceous earths for about 10 feet 

 vertically, overlain by GIohigerina-m.m:ls. The Oceanic Beds form 

 a small plateau or step just before the steep rise to the crown of 

 the hill, and are there terminated by the effects of two branching 

 faults (F. 2 & 3) having a total downthrow to the west of north of 

 about 130 feet, which bring the base of the Oceanic Beds down to a 

 level of 670 feet on the slope of the hill north-west of Park's Mill. 



The Glohigerina-maxls thus brought in form the mass of the 

 central part of the hill, and continue along the road for some 

 distance till at a point some 120 yards before coming to a branch- 

 road leading to Bissex Hill Estate House we pass over another fault 

 (F. 5) which brings up the Scotland Beds, succeeded near the branch- 

 road by the lower part of the Oceanic Series. The latter formation 

 continues for a short distance up the road which runs in an easterly 

 direction to the Estate House, but is cut off by a prolongation of 

 the fault last mentioned, and we again find ourselves (at an eleva- 

 tion of about 820 feet) on the Glohigerina-ma^rls. The direction of 

 this fault is to the north-north-east. A little farther east, just 

 beyond the entrance to the Estate House, are two exposures, one 

 (at a level of 820 feet) showing the Globigeinna-ma^rl overlying the 

 tipper Oceanic chalk, the other (at 830 feet) showing marl overlying 

 the radiolarian earths. Prom these facts we infer that a fault 

 breaks the succession of the underlying Oceanic Series, but does not 

 affect the Glohigerina-mavls : this is numbered 4 on the map,^ 



Coming to the point where a branch-road leads southward and 

 following this, it is found that it runs along the base of the Globi- 

 ^6rm«-marls for about 150 yards, the base being at a level of about 



' The topography of the accompanying map (fig. 1) is based on the large 

 map constructed by Sir E. Schomburgk in 1848, and we have inserted such 

 other topographical details as we have noticed during many visits to the locality. 

 The topography of Schomburgk's map is more precise than that of the 

 Admiralty chart which formed the basis of the geological map of the island 

 published in 1890. Indeed, the faults could not be correctly laid down on the 

 Admiralty chart. By an oversight, the basal reef -rocks are not shown in our 

 map ; they occur chiefly on the eastern part of Bissex Hill, and on the outlier 

 which ends in Monkey Hill. 



Q. J. G. S. No. 215. 2 p 



