322 It. J. L. Guppy — Naparima Rocks, Trinidad. 



is necessary to calculate the time taken to cut the cliff sections. To 

 be as brief as possible I have selected three sections on the Werribee 

 between Bacchus Marsh and Ballan. 



In compiling these notes I have assumed that the rainfall has not 

 been greater in past ages, say since the flow of newer basalt, than it 

 is on the average at the present time. 



VIII. — On the Naparima Rocks, Trinidad. 

 By E. J. Lechmere Guppy, Esq. 



I HAVE received a copy of the paper by Messrs. Harrison and 

 Jukes-Browne on the Oceanic Deposits of Trinidad, and wish 

 to place on record a few remarks on it. 



In the first place I must compliment these gentlemen upon the 

 manner, at the same time courteous and impartial, in which they 

 have dealt with my work. 



Our authors state that my writings leave both the nomenclature 

 and the succession of the Trinidad Tertiaries in a very uncertain 

 state. I am afraid that there is much of truth in this statement ; and 

 I should feel satisfaction could I clear up the uncertainty either by 

 producing evidence of a nature distinctly confirming or distinctly 

 refuting Professor Harrison's opinion that the Nariva Series is older 

 than the other Naparima beds, and that the Sanfernando beds are 

 closely connected with and are probably an upward continuation of 

 the Nariva Series. I have not been able to satisfy myself with 

 positive certainty either one way or the other. Our authors admit 

 themselves that no sections were seen showing the junction of the 

 two formations, but they consider that there is abundant evidence 

 that the two series occupy the relative positions assigned to them 

 by the geological surveyors. I am not so wedded to my own 

 opinion that I would not welcome theirs if I could be satisfied about 

 this evidence. But so far as I know, no evidence of a conclusive 

 nature is forthcoming, as in no place is the junction of the two series 

 seen. A similar doubt formerly prevailed respecting the junction of 

 radiolarian and foraminiferal beds ; but this has been dispelled, 



