Fearnsides, Elles, Smith — Palceozoic Hacks of Fomero//. Ill 



Zone of Ilonograptus tenuis = Edenvale beds. 



(4) Smooth blue-grey shales with black bands. M. 



M. cyphus. CI. rectangularis. 



(3) Black "blocky" mudstone (Dimorphograptus band). 



Ditnorphograptus confertus. D. longissimus. M. tenuis^ &c. 



Zone of Biplograptus modestus = Slate Quarry beds. 



(2) Micaceous grits and flags. Biplograptus vesiculosus. B. modes- 



tus. CI. normalis. CI. medius, &c. 



Zone of Cephalograptus acuminatus = Crocknagargan beds. 



(1) Micaceous flagstones and shales. Cephalograptus acuminatus. 



CI. normalis, &c. 



Desertcreat Group (= Ashgillian). 



Calcareous micaceous mudstones, flags, and grits of Girvan or 

 shelly type, with some graptolitic shales towards the top. 



Tirnaskea Eeds. 



(5) Smooth banded mudstones. JEglina rediviva, and Dicellu- 



graptus anceps. 



(4) Tough blocky calcareous grits. Phacops mucronatus^ and 



JDicellograptus complanatus. Biplograptus truncatus. 



Killey Bridge Beds. 



(3) Soft calcareous blue or grey chloritic mudstones, thick, and 



containing a very rich fauna. 

 ((^) Remopleurides Colbii^ and R. dorsispinifer. 

 (c) Trinucleus seticornis, and T. Portlochii. Ampijx rostratus. 

 {h) Phacops Brongniarti. 

 {a) Calymene Blumenhachii^ var. 



Bardahessiagh Beds. 



(2) Hard and calcareous flags and fine grits. Strophomena grandis 



and S. siluriana. Lichas hihemicus, and JIarpes Borani. 

 (1) Up consolidated sands and conglomerates, OrtMs and Stroplio- 

 mena, spp. 



