Vol. 67.] OP ANTIGUA AND OTHER WEST INDIAN ISLANDS. 693 



conspicuous was Uvigerina (Sagrina) raphanus, common in the 

 Sangregrande Beds of Trinidad. 



Of course, in Barbados I had no more idea of competing with 

 those excellent observers, Prof. J. B. Harrison and Mr. A. J. 

 Jukes-Browne, than I had in Antigua of rivalling Nugent and 

 Purves. I only made use of their work, in so far as it helped me to 

 elucidate the particular points which I had under consideration ; 

 and my work is merely supplementary to theirs, so far as it may 

 be admitted to be valid. 



Mr. Labastide, Manager of the railway, took me on his trolly as 

 far south as Bath and as far north as St. Andrew, thus enabling 

 me to inspect the strata of the Scotland district exposed along the 

 line. In Trinidad the Orbitoides Bed is found below the manjak- 

 deposits. And so in Barbados I procured samples of ' black sand ' 

 from the manjak and petroleum-deposits. But I found no 

 Orbitoides, either here or elsewhere in Barbados. What I thought 

 was black sand turned out on examination to be radiolarian rock 

 containing a very high proportion of carbonaceous matter, in fact 

 petroleum. There were a couple of foraminifera, namely, a small 

 Rotaline and a Uvigerina, but the bulk of what I had taken to be 

 sand was a mass of radiolaria. It is not to be supposed that 

 petroleum originated in the deep and clear water required for 

 radiolaria. I presume, therefore, that the petroleum has percolated 

 into the radiolarian rock from other deposits. 



In this part of Barbados the strata underlying the coral-rock 

 being, as the Oceanic Beds usually are, of yielding materials, are 

 readily loosened and carried off by the springs which break out 

 from under the coral-rock. Thus a gradual slipping-forward of 

 the whole region is induced, forming a kind of undercliff. Prof. 

 Harrison and Mr. Jukes-Browne do not seem to think that the 

 coral-rock, which forms an almost continuous sheet over the Island 

 of Barbados, ever completely covered the Scotland district. The 

 rocks named the Scotland Beds are chiefly exposed in this region, 

 and it was to these that I turned my attention. These rocks are 

 stated by Prof. Harrison and Mr. Jukes-Browne to consist of 

 thickly-bedded sandstones, coarse grits, etc. In their report on 

 the ' Geology of Barbados,' l they say that the Scotland Series 

 is a shallow-water formation, owing its origin to the detritus 

 carried down by the rivers running off a land that was com- 

 posed of quartz-bearing rocks. At Chalky Mount I saw a coarse 

 conglomerate, the pebbles in which are of some size and are 

 derived from a schistose or clay-slate formation, such as is found 

 in the northern parts of Venezuela and in Trinidad. Some of the 

 conglomerates were of quart/ose pebbles and sand, while others 

 contained pebbles of clay-slate ; and I thought that they bore a 

 stronger resemblance to fluviatile than to marine deposits, although 

 it is possible that some beaches under or near cliffs might be 

 similar. But there is no rock in Barbados whence such pebbles 



1 Published by authority of the Barbadian Legislature, 1890, pp. 11 & 36. 



