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Bulletin 35 
330 
One of these was whether the volcanic rocks underlay the cal- 
careous formation. I found no evidence that the}’ did, though 
Page 2 
they [it] may be admitted that it is very difficult to find anything 
like a satisfactory exposure of the junction of the rocks. I ar- 
rived at the conclusion that the volcanic rocks do not pass under 
the calcareous formation. In this conclusion I am supported by 
Professor Harrison, who also agrees with me on the second point 
of my inquir}’, which was as to whether the volcanic series had 
undergone submergence and re-elevation. It is probable that 
the sea at one time overflowed the central plain for it has left 
marine deposits and other marks of its sojourn there. But that 
it ever covered the volcanic hills since their formation is highly 
improbable. Meteoric water in cutting out and enlarging the 
ravines and denuding the slopes has no doubt given to the mater- 
ials re-deposited by it the character of alluvial or sedimentary de- 
posits, but this scarcely affects the general facts. When in Eng- 
land I submitted my rock .specimens to Mr. Prior, Mineralogist 
of the British Natural History Museum, and he was good 
enough to supply me with the following remarks : “One speci- 
men no doubt comes from a lava-flow, the others are andesitic 
tuffs such as are described in Purves’ paper.’’ The specimen he 
decides to be from a lava-flow came from a bed on the central 
plain. The andesitic tuffs are varied in appearance, but as Mr. 
Prior pointed out to me their origin from fragmentary matter 
can easily be detected. The central plain has been the scene of 
the most varied volcanic phenomena, including those of hot 
springs and lakes and of eruptions of lava and ejections of mat- 
ter from Drewhill and other volcanic vents. Not only does the 
central-plain contain volcanic accumulations and tuffs but it also 
contains disrupted fragments and outliers of the calcareous form- 
ation and deposits from lakes and hot .springs. I have already 
pointed out that the calcareous formation of Antigua is not a 
fragment of land, but a fragment of a marine formation devoid 
of the debris of land. No remains of any such formation are 
found on the volcanic islands of the Antilles at a greater height 
than 300 feet. Up to that height local marine deposits are found 
