178 MESSRS. J. B. HARRISON & A. J. JUKES-BROWNE [May 1 899, 



they were seen in a gravel-pit on the Fairfield Estate, and, as they 

 have never since heen recog-nized, they can hardly be a conspicuous 

 member of the series. It is stated that ' the cliffs of marl for some 

 distance north and south of San Eernando contain pure asphalt in 

 the fissures or joints ' ^ ; and the extent of the Naparima Marls is 

 shown in the geological map which accompanies the Report. 



In 1866 Mr. E. J. L. Guppy, in a paper on ' The Relations of the 

 Tertiary Formations of the West Indies,' referred to the five groups 

 above mentioned, and wrote : — ' Of these the strata exposed at San 

 Fernando, which were probably included in the ISTaparima Marls, 

 and those classified as the Tamana Series, seem to me to be the 

 oldest.' ^ He gives details of the cliff-section south of San Fernando 

 and a small diagram-section, to show the general succession of rock- 

 groups. It is noticeable that in this section the ISTariva Series does 

 not appear, and that the San Fernando Beds seem to take its place. 



In 1872 Mr. Guppy announced that some of his San Fernando 

 Beds were really foraminiferal marls ^ ; these he regarded as a 

 continuation of the beds in which he had found Nucula Schomburghi, 

 and he proposed to call them the i\^oc/osar?*« -beds, believing the 

 whole series to be of Lower Miocene age. In 1874, however, other 

 evidence made him regard them as Eocene. 



From a still later paper * it would seem that Mr. Guppy really 

 intended to separate the San Fernaudo Beds from the Naparima 

 Marls, for he refers the former to the Eocene and the latter to the 

 Miocene, and considers the probable order of succession to be as 

 follows : — 



Moruga Series =PIiocene. 



Caroni, Nariva, & 

 Naparima Beds 

 Tamana & San Fernando Beds = Eocene. 



I I =Miocene. 



It is to be noted that, up to 1892, Mr. Guppy had described only 

 the coast-section (in which the radiolarian rocks are not seen), and 

 had never discussed the geological relations of the beds existing in 

 the typical Naparima district. In the meantime Prof. Harrison 

 had visited this district, and had been impressed with the similarity 

 of the deposits to those which he had examined in Barbados, the 

 white marls of ISTaparima corresponding to the radiolarian marls of 

 Barbados and seeming to rest unconformably upon a series of clays 

 and sandstones which were comparable with the Scotland Beds of 

 the other region. This view of their relative position was published 

 in a joint paper by Prof. Harrison and myself on the Oceanic Series 

 of Barbados.^ 



In the same year Mr. Guppy communicated a paper to this 

 Society*^ in which he stated the conclusions at which he had then 

 arrived with regard to ' the stratigraphy of the Naparima Beds.' In 

 this paper he entirely abandons the name of San Fernando Beds, 



^ Mem. Geol. Surv. ISfiO, * Seport on the Geology of Trinidad,' p. 37. 



2 Quart. Journ. Geol. Soc. vol. xxii. p. 571. 



3 Geol. Mag. 1873, p. 3(^2. 



4 Proc. Sci. Assoc. Trinidad, pt. xi (1877) p. 113. 



^ Quart. Journ. Geol. Soc. vol. xlviii (189^) p. 218. ^ Ibid. p. 519. 



