Cambrian Terrain. 4*7 



black slates of Barrande's Etage B., which are plainly 

 laminated and are discordant in stratification to the Prim- 

 ordial Strata. These at the bottom consist of conglomerate 

 and sandstone with some thin clay slates ; and, beside Orthis 

 Remingeri, Ban-., contain trilobites of the genus Solenopleura 

 and a genus allied to Anomocare. This member of the series 

 is about 20 metres thick and is followed by a dark, crumbling 

 conglomerate 2 to 4 metres thick. 



Above this conglomerate is a sandstone bed of 10 metres 

 with broken but unquestionable remains of trilobites, and 

 then a zone of dark conglomerate of 4 to 6 metres. Upon 

 these beds follow the great zone of Paradoxides slates, 100 

 metres thick, with numerous fossils of the well known 

 Primordial Fauna. 



Above this zone follows one about 30 metres thick, of 

 a schistose porphyritic rock, corresponding in dip and strike 

 to the 3lates, &c. To this succeeds a zone of slate with 

 sandstone layers. This set of beds is 10 to 15 metres thick, 

 and in it has been found a head of Conocephalites striatus, 

 Emm. The upper bed has a very rich fauna, and is chiefly 

 characterised by Ellipsocephalus German, Barr. ; the next 

 most frequent species are Conocephalites striatus, Emm., 

 Paradoxides spinosus, Barr.. and Lichenoides priscus, Barr. ; 

 besides these, but much less frequent, are Conocephalites 

 Sulzeri, Schloth., C. Coronatus, Barr., and Arionellus cetice- 

 phalus, Barr. Much more frequent is a new species of 

 Arionellus, A. Spinosus, very much like Liostracus aculectus. 

 [L. Onangondianus, Htt., is the Canadian form, Gr. F. M.] ; 

 there also occurs here a species of the genus resembling 

 Anomocare, cited above, and an Agnostus, as well as three 

 species of cystideans, and two minute orthids, besides O. 

 Remingeri. 



Above these slates is a thick zone of conglomerate alter- 

 nating with sandstone and Paradoxides slate. This highest 

 conglomerate of the Cambrian is very similar to that near 

 the bottom of the terrain, being dark, crumbling and very 

 coarse grained. There are numerous remains of Paradoxides 

 scattered through the whole mass, and Sao hirsuta, Barr., 



