22 shelve district 



Table 9 



The number of pedicle or brachial valves of the listed 

 species recovered from 3 localities of Aldress Shales 



1 2 3 



Bicuspina subquadrata - - 1 



Dalmanella salopiensis transversa - 1 33 



Heterorthis sp. - - 1 



Horderleyella sp. - - 7 



Onniella ostentata lepida - 2 22 



Orthambonites sp. - - 1 



Palaeoglossa attenuata 1 - - 



Paterula cf. perfecta 1 - - 



Petrocrania dubia - — 1 



Platystrophia cf. major - - 1 



Plectorthis sp. - - 1 



Rafinesquina sp. - - 1 



Schmidtites ? simplex 1 - - 



Sowerbyella sericea permixta - 2 66 



occurring in the Hagley Shales. This lithofacies bears Sericoidea, while the rest of 

 the formation contains an association descended from that occurring in the Aldress 

 tuffs but with Onniella and Reuschella dominant, Sowerbyella playing a subordinate 

 role and Dalmanella no longer occurring (Table 10). This fauna attained its full 



Table 10 



The number of pedicle or brachial valves of the listed species 

 recovered from 4 localities of Hagley Shales 



1234 



Bicuspina subquadrata - - 1 1 



Caeroplecia plicata - - - 1 



Kiaeromena sp. 2 - - - 



Leptaena cf. ventricosa 2 1 - - 



Nicolella cf. actoniae - - - 1 



Onniella ostentata lepida 4 1 1 3 



Orthambonites sp. 1 - - 1 



Parastrophinella sp. - - - 1 



Petrocrania dubia - - - 1 



Platystrophia caelata 1 - - 1 



Plectorthis whitteryensis - - - 2 



Reuschella horderleyensis carinata 1 - 2 1 



Salopia sp. - - - 1 



Sericoidea cf. abdita - 10 - - 



Sowerbyella cf. sericea 2 - - 2 



diversity in the Whittery mudstones where Bicuspina, Caeroplecia, Nicolella, 

 Onniella, Orthambonites, Reuschella and Whittardia are very common (Table 11). 

 Many constituents, including Caeroplecia, Nicolella, Orthambonites, Palaeostro- 

 phomena and Platystrophia, reveal that the fauna is mainly composed of the Nicolella 



