FAUNAL SUCCESSION OF THE UPPER BERNICIAN 605 



Notes : — Mr. John Dunn, who collected in the shale for 

 upwards of twenty years, found a single specimen of a simple 

 coral, namely Dibunophyllitni. The structure is not wholly 

 preserved, nevertheless Dr. Vaughan has determined the 

 species as Dibunophylluui near B but showing variation 

 towards Dib. <^. 



Prodiictus scabriculus Mart, {quincuncialis, Phill.) common. 

 A mutation of the genus P. afif. scabricuhis intermediate 

 between C and D forms and converging towards P. corrugato- 

 hemisphericus* is also plentiful and characteristic of the 

 shale. Lingiila scotica, a large triangular species with fine 

 laminose concentric lines of growth, is not only restricted to 

 this horizon but has not yet been reported from any other 

 locality in England. 



More genera and species of lamellibranchs have been 

 obtained from this bed than from the rest of the Bernician 

 series. The Pteropod Conularia quadrisulcata is common at 

 Bellingham, but true gasteropods are not very plentiful. 



Redesdale Limestone. 



Stratigraphical Character. 



Thickness 17 feet (at Redesdale). The upper 6 or 7 feet 

 are argillaceously inclined, otherwise the limestone is massive. 



Faunal Diagnosis. 



Corals : — The corals are mainly typical of Dr, but 

 contain forms belonging to D2. Dibunophyllmn 0, Car- 

 cinopJiylliim 9, Cyatiiopiiyllum 7nurchiso7ii, Diphyphyllnm 

 stibibicinuin and Clisiophylloid Lithostrotion (all Di forms), 

 common and highly characteristic. Lithostrotion (D2), very 

 abundant. 



Brachiopods : — Giganteid Producti {Prod, a) exceedingly 

 numerous, otherwise the number of brachiopods is very much 

 less than in the limestone above. 



* Dr. A. Vaughan. 



E 



