﻿CONCLUSION. 



1 19 



of fossil remains; but at about a mile south of Ilfracombc, and perhaps within the limits 

 of Zone III, Mr. Valpy has found some Crinoidal remains, a fragment of a pipe-like 

 Annelid, and a very imperfect cast of Orthoceras, so that it would be hardly safe to desig- 

 nate this zone as " azoic." 



Zones IV and V comprise; what has been termed the Marwuod and Filton series 

 and would extend from a little below Woolacombe to the River Taw, or to 

 Brushford in Somersetshire ; but it has not yet been quite clearly mndc out to my mind, 

 that, palseontologically speaking, the Marwood and Pilton beds should constitute separate 

 groups. I must refer the reader to pp. 180-182 of Mr. Salter's paper on the 'Upper 

 Old Red Sandstone,' published in vol. xix of the ' Quarterly Journal of the Geol. Soc./ 

 for his views upon the subject. Mr. Salter considers the Marwood beds to be the 

 oldest, and to be separated from the Pilton series by a bed of greenish slate or silty beds 

 abounding in what I take to be Discina nitida and Lingula squamiformis, or L. Mola of 

 Salter ; and the upper portion of the Pilton beds would, according to the last-named 

 author, pass into true Carboniferous series. The Rev. P. Mules informs me, that what 

 appears to him reasonable of these Marwood beds would be, that they extend from 

 Baggy to High Bay, that at Braunton they are more than a mile wide, and throughout the 

 whole extent are either white or red or mixed sandstone at an high angle, but always with 

 oxidized red sand between them, and, when fossils appear, generally with humus ; 

 but immediately one comes to the Pilton beds, then red matter ceases, and the blue of 

 carbon stains the slates mixed with beds of lime. The Lingula-beds are in the midst of 

 the Marwood beds, but never in the Pilton beds. Sloly quarries, containing the Lingula 

 and Discina, belong to the Marwood beds. 



Possils in the condition of casts and impressions occur in immense abundance in a 

 number of localities throughout these zones ; and thanks to the kindness of the Rev. 

 P. Mules, of Marwood, Mr. J. Hall, of Barnstaple, Mr. Syrnons, of Braunton, and of 

 several other persons, I have been able to examine a very considerable number of fossils 

 from the Marwood and Pilton beds. I have also had many specimens from Baggy, 

 Croyde, and Sloly ; and after a careful investigation I was able to determine the following 

 species : 



1. Terebratida saccidus (rare). 

 12. — elongata. 



3. Athyris concentrica. 

 1. — sp., not determinable. 



5. Spirifera Vcrneuilii = disjuncta. 



6. — Urii. 



7. — sp. (not determinable). 



8. — crisfata, var. octoplicata. 



9. Hhjnchonella pleurodon. 



10. — laticosta. 



11. Strophomena analogu. 



12. Streptorhyachus crenistria. 



13. Orthis interlineata. 



14. — striatula vel resupinata? 



15. Chonetes Hardrensis. 



16. Strophalosia productoides vel caperata. 



1 7. Product us prcelongus. 



18. — scabricidits. 

 ?19. — longispinv.s. 



20. Discina nitida. 



21. Lingula squamiformis vel 3£ola. 



