1803.] SALTER UPPER OLD RED SANDSTOXE. 491 



Terebratula hastata, Spirifer heteroclytus ? (S. subconicus), Stropho- 

 menu Dutertrii, and StropJialosia suhaculeata ; also Favosites poly- 

 morphs, Cyaihopliyllum, and other Corals. Red shale, again, and 

 dolomitic limestone lead down to the Blacourt Limestone ( = Lime- 

 stone of La Cedule, (fee.), which is worked in part for iron-ores. Still 

 we have the same fossils, with some omissions and additions, and then 

 a series of shales, which is followed by compact micaceous sandstone 

 with Ferns*, Calamites (probably Bornia transitionis), &c, with some 

 of the above fossils. There is nothing in the whole section to indi- 

 cate that we have reached a lower horizon than that of the Marwood 

 beds. Mr. Austen's comparison of them with the Ogwell, Plymouth, 

 and Linton groups is the only flaw in an admirable paper. 



In Mr. Sharpe's paper in the same volume of our Journal t, an at- 

 tempt is made to compare the Belgian series with our British rocks. 

 Generally speaking, it comes to the same results as those given in 

 ' Siluria' above quoted. 



But the lower part of M. Dumont's " Systeme Condrusien" evi- 

 dently includes the Barnstaple (and Petherwin ?) group, resting as 

 this does upon the Eifel or Middle Devonian series. 



For the present it will be sufficient to indicate that the " Systeme 

 Condrusien" may be divided thus : — 



Upper = Carboniferous Limestone. 

 Lower = Barnstaple or Pilton group. 

 The grey micaceous sandstones and flags of the lower division certainly 

 point to the same horizon as the sandstones, shales, &e., of the Boulon- 

 nais, and M. Gosselet's important paper J only confirms this idea. 



I take advantage of this opportunity (referring to the abstract by 

 Mr. Pattison in the Journal for November 1861, vol.xvii. part 2. p. 27) 

 to enumerate the chief divisions of the series as given by M. Gosselet. 

 In descending order, his numbers are : — 



Nos. 1. ] English equivalents (J. W. S.). 



2. V Coal and Carboniferous Limestone. 



f Marwood beds; containing Phct- 

 cops latifrons, Athyris concen- 



4. PsammitesdeCondros=^ trica, Spirifer Verneuilii, and 



StropJialosia scabriculus (pro- 

 ' v bably& caperata). 

 C Petherwin beds and Upper Newton 



R cj, . «r, J Bushel limestone ; containing 



5. blates ot Famenne =< - nl 7 „ , ., c • v 



^l Mnynchoneua cuboiaes, bpimjer 



^ Verneuilii, Cardiumpalmatwn§. 



6. Givet limestone = Plymouth and Ogwell. 



7. Calceola slate = Limestone -shale (Chircombe, &c). 



* These fossils should be examined carefully. In all probability the Fern is 

 Adiantites Hibernicus. Moreover, the so-called Chraptolites from Caffiers have 

 been determined to be leaf-stems or -stalks. Here we have all the analogies of 

 the Marwood group. 



f Vol. ix. p. 18. + Bull. Soc. G-eol. de France, 2 me ser. vol. xviii. p. 18. 



§ The author specially remarks the absence of the Clymenia ; but though this 



2l2 



