280 



DR. C. A. MATLEY ON THE 



[May 1906, 



III. Description of the Eocks. [C. A, M.] 



(a) The Rush Slates and Passage-Beds (Zajphrentis-Be&s) . 



The Hush Slates are well exposed, when the tide is out, on the 

 shore south and south-east of Hush. They consist of black and dark- 

 grey, well-cleaved argillaceous slates, with numerous bands of dark, 

 less perfectly-cleaved, calcareous slate, sometimes containing nodules 



Fig. 2. 



Upper Dibunophyllu m- 



Zonc 



(Cyathaxonia-Bcds) 



C? Upper) 

 Seminula- 

 Rocks I zone 



^ Carlyan 

 Limestones 



(? Lower) 



> Srmiiuila.- 

 Zone 



Upper 

 \Syringothyris- 

 Rush > & Lower 



Conglomerate j Seminula-Zaae 



Grou P j Main 



% Rush Slates \SyrlngothyrU- 



Zone 



Map of the 

 c Carboniferous Rocks 

 ^ exposed on the Coast 

 at Rush. 



Scale: 3 inches = 1 mile. 



of impure limestone or intercalated with occasional well-defined 

 bands of moderately-pure limestone. Their base is not exposed. 

 The lowest beds visible are seen emerging from the sandy beach at 

 the western extremity of the rocky shore ; and there is a general 

 upward succession as the beds are followed along the coast, first 

 eastward and then northward towards Hush Harbour, before 



