272 MR. R. H. GOODE ON THE FOSSIL FLORA OF [June I913, 



(3) The so-called ' Millstone Grit/ 



The fossil plants obtained from the so-called 'Millstone Grit' 

 were nearly all collected from the beds between Monkstone Point 

 and a little south of "Waterwynch on the Tenby coast. 



In these beds, leaving out of account two doubtful determinations, 

 we find that all of the thirteen species recorded occur in the Middle 

 and Lower Coal Measures. Four, namely, Splienophyllum cunei- 

 foliu'm (Sternb.), Splienopteris schillingsii Andrse, Lepidodendron 

 obovatum Sternb., and Lepidophloios acerosus (L. & H.) are unknown 

 from the Upper Coal Measures, and two, Sphenopteris schillingsii 

 Andrse and Lepidodendron obovatum Sternb., are unknown from 

 the Transition Series. Thus the horizon is clearly either Middle or 

 Lower Coal Measures. The occurrence of Sphenopteris schillingsii 

 Andrse and Lepidophloios acerosus (L. & H.)in the Monkstone Point 

 beds, both of which are very rare in the Lower Coal Measures, makes 

 it more probable that at least these beds belong to the Middle 

 division rather than to the Lower, though the proof offered is not 

 conclusive. 



Further, the flora of these Monkstone Point and "Waterwynch 

 beds is very similar to that of the beds in the intervening ground 

 which have been placed low down in the Lower Coal Series. These 

 latter beds undoubtedly belong to the Middle Coal Measures, 

 especially as specimens which may be compared with Alethopteris 

 serli (Brongn.) have been obtained from them. There is, also, no 

 apparent unconformity between these Middle Coal Measures and 

 the so-called ' Millstone Grit ' of Monkstone Point, or between the 

 former and those seen in the cliff between 480 and 780 yards 

 south-west of Monkstone Point. Hence it may be inferred that 

 these ' Millstone Grit ' beds and those of the neighbouring Lower 

 Coal Series are on almost the same horizon. It seems, therefore, 

 that at least these particular ' Millstone Grit ' beds belong to the 

 Middle Coal Measures, those near Waterwynch being here excluded, 

 as they are separated by overthrust faults from the Coal Measures. 



Y. The Fossil Flora of the Pembrokeshire Coalfield compared 

 with that of the Main Portion of the South "Wales Coalfield. 



The only extant account of the fossil flora of the South Wales 

 Coalfield is that by l)r. Kidston x which was published in 1894. Our 

 knowledge of the fossil flora of this coalfield is still, however, very 

 imperfect, and much remains to be done. 



(a) The Fossil Floras of the ' Pennant Grit ' of Pembroke- 

 shire and the Lower Pennant, or Pennant Grit, of 

 South Wales. 



The fossil flora of the ' Pennant Grit ' of Pembrokeshire is, 

 as we have seen, a Middle Coal-Measure flora ; while that of the 



1 Kidston (1894). 



