Reports and Proceedings—Geological Society of London. 231 
1893, 4to, pp. 496; and Atlas, 4to, pp. 44 and plates 53, many of 
which are double or folding). 
‘‘ It has been reserved [says his reviewer’] to one favoured locality 
in a circumscribed area of Central France [Commentry] to furnish 
more specimens of fossil insects and in a better and more complete 
condition than in all the previously known localities of the world put 
together.” It may be of interest to record here that Dr. Brongniart 
discovered at Commentry the largest Dragon-fly known (Meganeura 
Mony1), measuring 28 inches in the spread of its wings. 
IRS OES IyS) eB) FSs54@) Spay Dam tess 
I.—Grotocicat Socrery or Lonpon. 
March 9, 1910.—Professor W. W. Watts, Se.D., M.Se., F.R:S;; 
President, in the Gian 
The Pasta announced that the Council had awarded the Proceeds 
of the Daniel Pidgeon Fund for 1910 to Mr. Robert Boyle, B.Sc., 
who proposes to make a series of researches on the Carboniferous 
Building-stones of Scotland. 
The following communication was read :— 
‘‘The Carboniferous Succession in Gower (Glamorganshire).”” By 
Ernest Edward Leslie Dixon, B.Sc., F.G.S., and Arthur Vaughan, 
Ben, DD). Sey F.G.S. 
The succession in three districts in Gower is described, the districts 
being so situated that a comparison of their respective developments 
can be interpreted in the light of the fact that, during Avonian time, 
the nearest coast lay to the north, with a general east-and-west trend. 
With the description of the lithological sequence are included notes 
on some breccia-like limestones, characteristic of D, and on ‘lagoon- 
phases’ and the origin of radiolarian cherts. To the faunal lists are 
added notes on the D,—D, phase of the Dibunophyllum-zone, which 
distinguishes Gower from the rest of the South-Western Province at 
present known, and on the correlation of that zone with the Upper 
Bernician of Northumberland. From the faunal sequence it is 
concluded that the zones Z, C, 8, D,, and D, (the K Zone is poorly 
exposed) are characterized by the same assemblages as in the 
Bristol area. 
The lithological sequence shows (1) that over the whole area the 
depth of the Carboniferous sea underwent a complete cycle of inter- 
mittent change during Lower Avonian time, the initial deepening 
being followed by gradual shallowing up to the top of the lower part, 
C;, of the Syringothyris-zone, which was deposited almost at sea- 
level; (2) that a similar cycle marked the ensuing period up to the 
top’ of the Seminula-zone ; ; (38) that a similar but “smaller cycle took 
place in the Dibunophyllum-zone, the latter actually reaching the 
surface; and (4) that a fourth cycle, commencing with a far-reaching 
physiographic change, characterized the Posidovomya-zone. 
Further, a comparison of the sequences and thicknesses in the threc 
1 Grou. Mac., 1895, pp. 233-6. 
