Reports and Proceedings — Geological Sociefij of London. 573 



This valley was brought to light in building a bridge across the 

 Eiver Towy at Drysllwyn, 9 miles from Caermarthen, to which 

 the tide now flows. At the bridge the valley is narrowed to about 

 half a mile. Near the water-edge the rock sloped down gradually 

 to 23 feet below summer water-level, and was glaciated in large 

 furrows a foot or more across, and striated blocks of grit rested 

 upon it. About 60 feet farther out into the river, rock was not 

 met with till depths of from 34: to 42 feet below summer level were 

 reached, and the rock-surface was found to be sloping towards the 

 south at an angle of from 28° to 18° with a vertical line ; it was 

 followed down to between 45 and 56 feet below summer water-level. 

 Scratched stones were again met with in the clay near the rock. 

 The glaciated surface on the northern bank is only 25 feet above 

 sea-level ; and the rock-surface is sloping down at a precipitous 

 angle at 8 feet below sea-level at a distance of 18 miles from the 

 mouth of the river. 



2. " On the Clarke Collection of Fossil Plants from New South 

 Wales." By Edward Alexander Newell Arber, Esq., B.A. (Com- 

 municated by Professor T. McKenny Hughes, B.A., F.R.S., F.G.S.) 



This collection, numbering nearly 2,600 specimens of all kinds, 

 including some 80 fossil plant-remains, was presented to the 

 Woodwardian Museum, Cambridge, in November, 1844. 



The following is the stratigraphical succession in New South 

 Wales : — 



4. Wianamatta and Hawkesbury Beds. 

 3. Newcastle Beds. 



( c. Upper Marine Beds. 

 2. Marine or Muree Beds. | b. Lower Coal-measures. 



( a. Lower Marine Beds. 

 1. Lepidodendrmi-\)eAs (Arowa, etc.). 



Four species from the Wianamatta Series are described, fourteen 

 species (including one new one) from the Newcastle Series, and 

 two from the Arowa Beds. Of the twelve new types described by 

 McCoy,' five (namely, Odontopteris microphylla, Sphenopteris plumosa, 

 Glossopteris linearis, Phjllotheca ramosa, and Fh. Hoolceri) are no 

 longer considered as such. One new type has been added. 



The age of the beds is then discussed. Such evidence as the few 

 plants in the Clarke Collection afford supports Feistmantel's con- 

 clusion that the Wianamatta Beds are of Triassic age. Thinnfeldia 

 odontopter aides occurs in Ehsetic beds in South America, and the 

 identification of Eattee's Salishiria palmata with the American 

 Baiera multifida, and a comparison with the Ehsetic Baiera Steinmanni 

 of Chile, is a new point in favour of this conclusion. The plants 

 also support Feistmantel's opinion that the Newcastle Beds are 

 equivalent to the Permian of Europe. The exact horizon and age 

 of the Arowa Beds must for the present remain doubtful. 



3. " On an Altered Siliceous Sinter from Builth (Brecknockshire)." 

 By Frank Eutley, Esq., F.G.S. 



1 Ann. Ma?:. Nat. Hist., 1847, vol. xx. 



