468 Dr. Nugent on the Geology of the Island of Antigua . 
dominance of the trap masses contained therein ; it then assumes 
much the outline of a trap breccia. I have endeavoured to repre- 
sent this by mixing the colours blue and green, in the colouring of 
this district. 
I have marked on the map, in blue, nearly the whole mountain 
range, and stated that it represents trap rocks. The natural enquiry 
will be, of what nature are they, and to what formation do they 
belong. They may, I think, be referred most probably to the 
newest ficetz trap formation ; and consist chiefly of wacke por- 
phyry, wacke breccia, and a general trap breccia, the principal con- 
stituents of which are fragments of greenstone and wacke porphyry; 
they occur without any apparent order or regularity, and many of 
them constitute mountains of several hundred feet in extent. I am 
now convinced that all this trap series can be considered only as 
enormous boulder-shaped masses, subordinate to, and included in, 
the conglomerate ; but having so great a preponderance over the 
matrix in quantity and size, as to give a distinct character and 
outline to the hills. The conglomerate matrix, however, with its 
peculiar feature of numerous spots of the chlorite baldogee, may be 
occasionally seen; and I have represented two or three places where 
it is most distinct. Generally speaking, the western part of the 
mountain range exhibits more of the conglomerate, as on both shores 
of Five Island Harbour ;* and the eastern part, near Howard’s and 
Sugar-Loaf Hill, scarcely has any trace of it. According to this 
idea, this part of the map should in strictness have been coloured 
green also ; but as the conglomerate here shews little or no stratifica- 
tion, but occurs more in the form of beds, and as the constituent 
* Close to the house at the Hermitage, I perceived a few conglomerate strata in a 
vertical position. 
