No CrossRef data available.
Published online by Cambridge University Press: 01 May 2009
1 [Permission to reproduce the two plates which accompany this article (Plates XV and XVI) has been granted by Dr. A. W. Rowe, F.G.S., the author of the paper, Professor H. E. Armstrong, F.R.S., who is the author of the photographs, and by the Council of the Geologists’ Association, who published Dr. Rowe's memoir.— Edit. Geol. Mag.]