280 Reports & Proceedings — Geological Society of London. 



and the American Continent, due to tlie great uplift of the whole 

 region by several thousands of feet during the Mio-Pleistocene Epooh. 

 The chart showed at a glance the submerged structure of the ocean- 

 bed and bordering coasts on both sides of tlie ocean, indicating a rise 

 of 1,000 to 1,200 fathoms (6, 000 to 7, 000 feet) during the culminating 

 stage of the Glacial Period. This was proved by the fact that the 

 channels of the existing rivers — such as the Loire, the Adour, the 

 Mondego, the Tagus, and the Congo — were continued down to 

 the depths above named, across ' the Continental Platform ' and 

 ' the Great Declivity ' to the floor of the Abyssal Ocean. The 

 details had been worked out by means of the soundings taken from 

 the Admiralty charts and the isobathic contours, the details of which 

 are recorded, with the charts appertaining thereto, in the speaker's 

 Monograph, of the Sub- Oceanic Physiography of the North Atlayitic 

 Ocean. In the view of tiie speaker this great uplift of the Northern 

 Hemisphere was the vera caum of the Glacial Period or ' The Great 

 Ice Age' of Professor James Geikie. 



The following communications were read : — 



1. "On the Fossil Flora of the Pembrokeshire Portion of the 

 South Wales Coal-field." By Reginald H. Goode, B.A. (Com- 

 municated by Dr. E. A. Newell Arber, M.A., F.G.S.) 



Of the fifty -three determinable species of fossil plants obtained 

 from the Pembrokeshire portion of the South Wales Coal-field, three 

 are new species. One may be referred to Linopteris hrongniarti, Gutb., 

 a plant which has not with certainty been found before in Britain. 



From the palaeobotanical evidence it is clear that the so-called 

 ' Pennant Grit ' of Pembrokeshire cannot be regarded as the 

 equivalent of the Pennant Grit of the main portion of the South 

 Wales Coal-field, for the plants indicate that these beds are Middle 

 Coal-measures, and do not belong to the Transition Series. The 

 Lower Coal Series also clearly belongs to the Middle Coal-measui'es ; 

 and the Settlings Beds, and perhaps the Falling Cliif Beds as well, 

 lie probably at a higher horizon than the Lower Coal Series as 

 developed farther east along the Saundersfoot coast, and even possibly 

 higher than the Timber Vein group. 



Until more plants have been obtained from the so-called ' Millstone 

 Grit' of Pembrokeshire, it is impossible to fix definitely the horizon 

 of these beds from the palaeobotanical evidence. However, from the 

 fossil plants obtained in the so-called ' Millstone Grit ' of Monkstone 

 Point, and in neighbouring beds belonging to the Lower Coal Series, 

 between which there is no apparent unconformity, it is evident that 

 these particular beds, assigned to the Millstone Grit, probably belong 

 to the Middle Coal-measures. 



When the fossil plants whicli have been obtained from the Pem- 

 brokeshire Coal-field are compared with those which have been 

 recorded from the main South Wales Coal-field, it is evident that 

 there are considerable differences in the occurrence of the species. 



Thirty-two fossil plants have been obtained from the Middle Coal- 

 measures of Pembrokeshire which have not as yet been recorded from 

 those of the main South Wales Coal-field, and hence are additions to 



