124 



ME. GAEDINEE AND PEOF. EEYNOLDS OUT THE 



[May 1909, 



we have described as limestone-breccias. In the great majority of 

 cases the limestone undoubtedly occurs in the form of disrupted 

 blocks embedded in a calcareous ashy matrix. It seems impossible 

 to avoid the conclusion that, after the deposition of the fossiliferous 

 limestone, it was in some places broken up by volcanic eruptions, 

 and the fragments, accompanied by fragments of felsite, were em- 

 bedded in a tuff -which must thus be of later date than the limestone. 

 It does not, however, follow that there was any very great interval 

 of time between the deposition of the limestone and its disruption, 

 succeeded by the embedding of its fragments in a coarse tuff. The 

 character of the fossils shows that both original deposition and 

 redeposition after disruption took place during Llandeilo times. 

 The view of the explosive origin of the limestone-breccia affords an 

 adequate explanation of its patchy method of occurrence. 



(c) List of Fossils from 

 the Llandeilo Beds. 



Shangort Beds. 

 (Gritty and Ashy Series.) 





SO 



Sh O 



TODEMAKEADY BEDS. 



(Calcareous Series.) 



^-o cio" 



UiJsJrliS 



q s 510 rt docs 

 1 T 5^&i"ofe =2 



. r. 



=s as e^la^iSi s^ig-i 



Acrotreta (?) hibernica, sp. nov. ... 



Carrier ella tkomsoni, Dav 



CamereUa (?) sp 



Cf. Leptana llandeiloensis, Dav. ... 



IAnguta brevis, Portl. (?) 



Lingula ovata, M'Coy 



Orhiculoidea sp 



Orthis cf. acton ia, Sow 



Orthis calligramma, Dalm 



Orthis cf. c'hrist Hernia, Kjer 



Orthis crispa, M'Coy (?) 



Orthis elegantula, Dalm 



Orthis cf. intercostata, Portl 



Orthis cf. interplicata, M'Coy ... 



Orthis simplex, M'Coy 



Orthis testudinaria, Dalm. (?) 



Orthis sp. indet 



Orthisina ascendens, Panel er 



Fleet ambonites quinquecostata, 



M'Coy 



Fleet ambonites sericea, Sow 



Porambonites cf. intercedes s, 



Pand er 



Porambonites sp 



Scenidium (?) sp 



Streptis affinis, sp. nov 



