238 Correspondence—Edward Greenly. 
cause of the movement. Lastly, in the case which presents by far 
the greater difficulties, the material is limestone and shale instead 
of cobbler’s wax. The author maintains that Professor Lugeon’s 
hypothesis receives no real support from Professor Sollas’s experiments, 
and involves mechanical difficulties which are practically insuperable. 
2. ‘The Coral Rocks of Barbados.” By Professor John Burchmore 
Harrison, C.M.G., M.A., F.1.C., F.G.S. 
The results of the author’s extended, and in many places detailed, 
re-examination of the coral rocks in the southern half of Barbados, 
give no.support to Dr. J. W. Spencer’s theory of the existence of 
strata of the ‘‘ Antigua Formation ” in that island: It is now shown 
that a certain knoll, whence Dr. Spencer collected corals which in his 
estimation proved that it and other parts of the coral rocks were 
of Oligocene age, is in part made up of corals which, as stated by 
Professor J. W. Gregory, ‘‘ certainly show no evidence of any age 
greater than the Pleistocene.”” The author has failed to find any 
signs of the widespread formation, described in Dr. Spencer’s paper 
as extending from Mount Misery to near Ragged Point, a distance 
of about 11 miles, and dipping south-eastward at from 12° to 20°. 
Such a formation would be about 15,000 feet thick; while the facts 
that nowhere in the island does the combined thickness of the 
limestone and of its basal or Bissex Beds exceed 280 feet, and that 
the limestone is not traversed by faults, are fairly conclusive evidence 
of the non-existence of such a formation. This dip is referred to the 
action of landslips in some cases, and in others to current-bedding. 
The author’s recent investigations have confirmed the statements 
made and the views expressed by Mr. Jukes-Browne and himself 
an the notes published in the Guronogican Macazinr for December, 
1902, p. 530. 
CORRESPONDENCE. 
SANDSTONE PIPES IN CARBONIFEROUS LIMESTONE, ANGLESEY. 
Smr,—In the Guoroctcan Macazine for January, 1900 (p. 20), was 
published a paper (read and discussed at the Dover Meeting of the 
British Association in 1899) on Sandstone Pipes in the Carboniferous 
Limestone of Anglesey, in which I showed that they formed a part of 
the Carboniferous Series, and were evidently due to some unusual 
kind of contemporaneous erosion. 
In November last Professor W. H. Hobbs, Secretary of the 
American Seismological Committee, wrote to me suggesting that these 
pipes might be the ‘ craterlets’ of Carboniferous earthquakes, produced 
by disturbance of underground waters in the same way as those of 
the Calabria, Charleston, and other shocks of recent times. Some of 
those of Calabria are figured in Lyell’s Principles. The Comte de 
Montessur de Ballore, to whom Professor Hobbs asked me to send 
photographs, has concurred, after some correspondence, in this 
explanation. 
