Notices of Memotrs—Life-Zones in Carboniferous Rocks. 465 
Noha, the principal difference being that the beds of ash are thicker 
and better consolidated, evidently pointing to deposition in deeper 
water. 
Many of the very highest peaks, such as Mont aux Sources, Motai, 
Mount Hamilton, are not described here, as the writer has never been 
able to visit them. 
A short notice of the intrusive sheets and dykes is a necessary 
complement to the description of the lavas. These dykes, etc., are 
posterior to the voleanic beds which they traverse. None, so far as 
the writer knows, have the characteristic of a lava-flow. 
They vary much in size, from a few inches thick and a few yards 
long up to 20 feet or more in thickness and several miles in length. 
Two remarkable examples of the latter kind occur in South Basutoland, 
near Mohales’ Hoek. ‘he dolerite is columnar, and as straight as if 
laid out artificially. Small displacement of the neighbouring strata 
is a conspicuous feature of these dykes. 
The country owes its present configuration to two series of earth 
movements — one from west to east and the other from south to 
north, long afterwards. There is no evidence of denudation before 
the deposition of the lavas, and the writer is of opinion that the lavas 
were not all subaqueous. 
VII.—Lirr-Zones iy tHe British Carsontrerous Rocxs.! 
HE part of the Report for 1906 which deals with the Carboniferous 
zones in Flintshire was founded on work done by Dr. Hind and 
Mr. Stobbs. Their conclusions were presented in a paper read before 
the Geological Society of London on April 4th, 1906. The Committee 
are not unanimously in agreement with some of the conclusions. On 
reference to the Abstr. Proc. Geol. Soc., No. 827 (1906), pp. 88-92, 
it will be seen that differences of opinion exist both as to the sequence 
and classification of the Carboniferous rocks of Flintshire. 
In 1895, at the meeting of the Association at Ipswich, a paper was 
read before Section C by Messrs. Garwood and Marr in which they 
suggested ‘‘that a Committee be appointed to inquire into the 
possibility of dividing the Carboniferous rocks into zones, to call the 
attention of local observers to the desirability of collecting fossils with 
this view, and, if possible, to retain the services of eminent specialists 
to whom these fossils may be submitted.’”’* As the result of that paper 
the present Committee was appointed at the same meeting. 
Much has since been done, largely owing to the work of the 
Committee, and especially by the researches of Dr. A. Vaughan, 
whose well-known paper on the ‘‘ Paleontological Sequence in the 
Carboniferous Limestone of the British Area” has in an eminently 
1 Report of the Committee, consisting of Mr. J. HE. Marr (Chairman), 
Dr. Wheelton Hind (Secretary), Dr. F. A. Bather, Mr. G. C. Crick, Dr. A. H. Foord, 
Mr. H. Fox, Professor E. J. Garwood, Dr. G. J. Hinde, Professor P. F. Kendall, 
Mr. R. Kidston, Mr. G. W. Lamplugh, Professor G. A. Lebour, Mr. B. N. Peach, 
Mr. A. Strahan, Dr. A. Vaughan, and Dr. H. Woodward. Read before Section C 
(Geology), British Association, Leicester, 1907. 
* Report British Association, 1895 (Ipswich), p. 696. 
DECADE Y.—VOL. IV.—NO. xX. 30 
