TEILIA QUARRY, GWAENYSGOR, NEAR PRESTATYN. 



427 



General Remarks. 



The following Table shows the distribution of the Teilia Quarry species in the 

 Lower Carboniferous rocks of Scotland, with the horizon in which they occur : — 



Asterocalamites scrobiculatus, Schl., sp., . 

 Adiantides antiquus, Ett., sp., . 

 Rhacopteris flabellata, Tate, sp., 



„ incequilatera, Gopp., sp., 



(?) Archceopteris, sp., 

 Sphenopteris subgeniculata, Stur., sp., 

 Teiliana, n. sp., . 

 pachyrrachis, Gopp., . 



„ forma stenophylla, Gopp., 

 (?) „ Schlehani, Stur., sp., 



S P 



(?) Fructification of Fern, 



Lepidophloios, sp., ..... 



(?) Cordaites, sp., . 



Teilia Quarry. 



, Scotland. 



Carboniferous Lime- 

 stone Series. 



(Genus). 

 (Genus). 



Calciferous Sand- 

 stone Series. 



'(Genus). 



(Genus). 

 (Genus). 



Mr A. J. Jukes-Brown, F.G.S.,* suggests that the Upper Black Limestones in 

 which Teilia Quarry is situated, may probably represent the Yoredale Group ( = 

 Carboniferous Limestone Series of Scotland), but, from reasons to be given presently, 

 I am rather inclined to think that these Flintshire beds belong; to a lower horizon than 

 the Yoredales. 



If the species which have been specifically identified from Teilia Quarry be com- 

 pared with the fossil flora of Scottish Lower Carboniferous rocks, it is seen that seven of 

 the Teilia plants are known to occur in the Calciferous Sandstone Series of Scotland 

 and only two in the Carboniferous Limestone Series of Scotland, which latter series is 

 supposed to embrace the equivalents of the Yoredale Group. Although then admitting 

 that a number of Lower Carboniferous plants are common to the Carboniferous Lime- 

 stone and Calciferous Sandstone Series of Scotland, yet so many of the species that 

 occur at Teilia have only been discovered hitherto in the Calciferous Sandstones that I 

 believe the Teilia beds are more probably of Calciferous Sandstone than of Carboniferous 

 Limestone age. Little or no assistance is given in deciding this point by the Molluscan 

 remains, as some of them extend from the base to the top of the Carboniferous Forma- 

 tion, whereas the Lower Carboniferous plants have a limited and definite distribution, 

 none extending into the Upper Carboniferous, with perhaps one doubtful exception. 



* Students' Handbook of Historical Geology, p. 191, 1886. 

 VOL. XXXV. PART II. (NO. 11). 



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