336 PROF. J. B. HARRISON ON [Aug. I907, 



Summary. 



The results of my extended, and in many places detailed, re- 

 examination of the coral-rocks in the southern half of Barbados 

 give no support to Prof. Spencer's theory of the existence of strata 

 of the ' Antigua Formation ' in that island. He claimed to have 

 collected fossil corals from a certain knoll, which proved it, and 

 other parts of the coral-rocks, to be of Oligocene age ; but it is 

 now shown that this knoll is in part made up of corals which, as 

 stated by Prof. Gregory, 



' certainly show no evidence of any greater age than the Pleistocene.' (P. 334.) 



I have failed completely to find any signs of the widespread 

 formation described in Prof. Spencer's paper as extending from 

 Mount Misery to near Eagged Point, a distance in a south-easterly 

 direction, as the crow flies, of about 11 miles, and dipping south- 

 eastward at angles of from 12° to 20°. It is unlikely that I should 

 not have detected some traces of a formation which, if dipping 

 continuously for 11 miles at a mean angle of 15°, would be about 

 .15,000 feet thick ; while the facts that nowhere in the island does 

 the combined thickness of the limestone and of its basal or Bissex 

 Beds exceed 280 feet, and that the limestone is not traversed by 

 faults, are fairly-conclusive evidence of the non-existence of such a 

 formation. 



I have shown that, wherever beds dipping at considerable angles 

 occur in the limestone-strata in the district under discussion, their 

 inclination, where not caused by landslips, is due to Current- 

 action ; and, in the latter case, the beds are in positions in which 

 the topography and the contour of the island would naturally 

 lead us to expect them to be found. 



My recent investigations have completely confirmed and justified 

 the statements made and the views expressed on this subject by 

 Mr. Jukes-Browne and myself in the paper published in the ' Geo- 

 logical Magazine ' of December 1902. 



General Conclusions. 



Prom the results detailed in this paper, in earlier papers (including 

 those by Prof. Gregory), and from observations which I have made 

 during short visits to Barbados since I left the island in 1889, 1 am 

 of opinion that four distinct formations are recognizable in Barbados. 

 These are, in ascending order : — 



(1) The Lower Scotland Group, which consists of highly- 

 contorted and much-faulted clays with septarian and ironstone- 

 concretions, sandstones in places calcareous but usually siliceous, 

 and coarse conglomerates made up of pebbles of quartz with some 

 of felspar. This group probably corresponds to the so-called 

 4 Cretaceous' Series in Trinidad. 



(2) The Upper Scotland Group, consisting principally of a 

 great thickness of bluish-grey clay, which contains small quantities of 



