ROCKS OF SOUTH DEYON. 513 



small fossils in similar slates, which appeared to me to resemble 

 the Saltern-Cove fauna ver}^ badly preserved. 



These green and lilac slates are not similar to the types of 

 the Goniatite-beds we have been considering ; but they occur where 

 we should expect to find Erasnian beds represented ; and therefore, 

 if the fossils in them in any way resemble the Goniatite-fauna, 

 they are more likely to belong to it than to other horizons, as we 

 do not find the Posidonomya venusta and Eyitomis in their vicinity. 



To the north of the Entomis-slates, which are continuous by 

 fossils from I^ewton to Houghton, and by lithological character 

 from thence to Woodland, I feel convinced that these practically 

 unfossiliferous slates would reveal to a patient searcher traces of the 

 Goniatite-fauna, my find at WrigweJl House being quite accidental, 

 and the time at my disposal much too limited for protracted search 

 for fossils. 



The relations of the Upper-Devonian slates to the Middle- 

 Devonian slates and limestones of Chircombe Bridge and Eradley 

 Manor, as also to the limestone of East Ogwell, are such as 

 I can in no way account for by ordinary faults or plications, but 

 such as would be explained by thrust-faults, or by the abrupt termi- 

 nation of the limestones, and the slower rate of accumulation of 

 muddy sediments on their borders ; for the limestones which these 

 slates bound at East Ogwell and Ramsleigh seem to be higher in 

 the series than those which they bound at Bradley Manor ; and 

 this difficulty is not to be explained by assuming that the slates in 

 the former case represent higher Upper-Devonian beds than those 

 in the latter. 



3. Cypridinen-Scliiefer (^Entomis-slates). 



The description of these beds has been almost completed by the 

 references to them in the previous notes. 



They occur in the area between Kingsteignton and Bishop- 

 steignton, on each bank of the Teign, where the characteristic 

 Posidonomya and Eiitomis, with an occasional imperfect Trilobite 

 (perhaps Phacops), have been found in them. On the other side of 

 the Teign alluvium from Knowles Hill, Ts^ewton-Abbot (where 

 contact alteration with diabase has converted them into spilosite in 

 places), to Highweek and Houghton their occurrence is similarly 

 proved by fossil evidence. They are recognizable by similar cha- 

 racteristics near Hsham and Anstey's Small Cove. 



In Whiteway farmyard greenish-grey clay-slates were identified 

 as Cypridinen-Schiefer by Kayser, who mentions the occurrence of 

 numerous examples of Posidonomya venusta as well as Trimero- 

 cejplialus cf. cryptophtJialmus in them. At Goodrington red clay- 

 slates contain Posidonomya venusta and Entomis serratostriata . 



The faulted inliers of Upper-Devonian slate in the Culm-measure 

 area between Bickington and Bovey-Tracey contain beds of dif- 

 ferent lithological type, all of which have their analogues in the 

 Chudleigh district and in the Upper-Devonian tract between Eydon 



