1878.] -H1 [Crosby. 
developed in Venezuela, is inferior in position to any of the rocks 
exposed in Trinidad.” This author considers the Parian strata as 
thrown down to the north of Trinidad by an east-west fault, and 
also finds topographic evidence for the existence of other lines of 
dislocation parallel with this one, having the down-throw in each 
case on the north, and augmenting the apparent thickness of the 
entire series. I have not seen the evidence indicated by Mr. Guppy, 
but to my mind the otherwise enormous volume of the “ Caribbean 
Group ” renders the existence of these faults highly probable. 
That the rocks on the Point of Paria belong, in their normal posi- 
tion, below the Trinidad portion of the series, is evidenced not only 
by their stratigraphy, but also, as I think, by their more crystalline 
character. Following is Mr. Wall’s description! of these rocks: 
“Commencing at the Punta de la Pena, a well defined eneiss is - 
encountered, containing green and light red mica, with a soft feld- 
spar readily decomposing... . . There is also a green rock, consist- 
ing of talcose matter, with some chlorite and dark colored mica, and 
finely divided material, probably feldspathic and siliceous substances. 
....In Megillones Bay the gneiss gradually loses the tabular 
structure, becoming massive and somewhat granitoid. . . . . Return- 
ing to the Punta de la Pena, and proceeding south-west, near Celeste 
Point, the green talcose rock is again observed, and seems here to 
graduate into the gneiss, no defined line of junction existing. A 
short distance beyond the Point it alternates with the gneiss in 
layers of two to four feet thick; to these a number of feldspathic 
beds are soon associated, the most definite of which is a mixture of 
quartz and white feldspathic base, exhibiting no foliation, but a 
tendency to planes of contact with the adjoining strata. After some 
distance, in which the precise nature of the rocks is rather ambig- 
uous, the character of quartzose and micaslates is gradually assumed, 
becoming more micaceous on receding from the gneiss. The color is 
first green, afterwards light yellow and whitish.” 
The Northern Mountains of Trinidad present at most points the 
following section, in ascending order, from north tc scuth: — 
1. A series consisting largely of quartzite, in heavy beds; stratifi- 
cation usually thin and distinct, sometimes messive. This rock is 
generally, perhaps always, slightly micaceous. The mica occurs in 
minute spangles, and is aggregated chiefly along the planes of division 
1 Report on the Geology of Trinidad, Appendix B. 
