154 HIXD : CARBONIFEROUS ROCKS OF ISLE OF MAX. 
Professor Boyd Dawkins, who believes the rocks to be of 
Permian age, states on the authority of IMr. E. T. Newton, 
that Griffithides glaber and Chonetes Laguessiana occur in pebbles 
in the Peel Sandstones, but the majority of fossils found are 
of Keisle}^ Limestone age.* 
I have to thank Dr. A. Vaughan and Mr. T. F. Sibly for 
kindly determining corals collected at the various quarries and 
exposures in the Island, and congratulate myself that I was 
fortunate enough to have the company of Mr. Sibly over the 
ground on the occasion of the visit of the Yorkshire Geological 
Society. His views are the more valuable because I have long 
had correspondence with him and Dr. Vaughan both on the 
zonal value and inferences to be drawn from the fauna. 
To my friend ^Ir. Lamplugh I must give my heartiest 
thanks for valuable suggestions and criticisms, and for reading 
the proofs while the paper was passing through the press. 
To Mr. Godfrey Bingley I owe my best thanks for the 
beautiful photographs which illustrate this paper and the note 
on Carboniferous Graptolites in this volume. 
* Q. J. Geol. Soc, vol. 58, pp. 633-661. 
