322 Trof. Laincorth — Talceozoic Rocks of Britain ^ Scandinavia. 



(3.) TiKvk (i\n.j sl^ie vn'fh Paradoxides Forchhanimeri 22 feet. 



containing among other forms, Aynosfits Ejerulji, A. brevifrons, Ang., 

 j4. aculeatus, Ang., A. glandiformis, Ang., A. Icevigatits, Dalm., and species 

 of Protospoiigia 



(2.) Black clay slate witti P«ra<foa;i<?es TessjVn' 60 feet. 



together with Paradox, rugulosus, Brog. (an associate of P. Davidis at 

 Bornholm), Agnostics fallax, Linrs., A. parvifrons, Linrs., A. gibbus, Linrs., 

 A. ince7-tus, Brogg., forms all characteristic of the same heds in Sweden. 



(1.) Greywacke Schists, sandstone, and conglomerate Sfeet.' 



In the well-known Lower Palseozoic series of Christiania, the 

 Paradoxidian proper is so poorly developed that it has not yet been 

 definitely recognized ; and the Alnm Schists of the neighbourhood of 

 that city, which are about 100 feet in thickness, appear to belong 

 almost entirely to the Olenidian. It may be regarded as certain that 

 all the Swedish paleeontological zones will ultimately be recognized 

 within them, as they are known to contain the characteristic 

 species : — 



d. Bictyonema flabelliforme."^ 



c. Peltura scarabeoides, Orthis lenticularis. 



b. Parabolina spinulosa, Sphmrophthalmus alatus. 



a. Olenns gibbosus, Agnostis pisiformis, Lingulella Davisii, etc. 



On Lake Miosen,^ red and white quartzose sandstone is overlain 

 by (a) green clay slate with Paradoxides Kjerulfi, Linrs., Arionellus, 

 (h) Alum Schist with Agnostus parvifrons, and (c) Alum Schist with 

 Agnostus pisiformis. To the northward of this locality the Cambrian 

 zones are confusedly intermingled with metamorphic rocks, and 

 have themselves been so pierced and hardened by igneous intrusions 

 that they are no longer individually recognizable ; and with the 

 disappearance of their fossils they lose their interest for the com- 

 parative geologist. 



In the preceding table (pp. 320-321) the accepted divisions and 

 subdivisions of the Cambrian strata of Britain and Scandinavia are 

 arranged in parallel columns, the local zones which seem to be of the 

 same general geological date being placed in corresponding positions. 

 The more important data brought forward in the foregoing pages 

 are inserted, together with much that is already familiar to British 

 geologists. The detailed classification of the various fossil iferous 

 zones recognizable in the Harlech Eocks of St. Davids has been 

 copied from some unpublished notes kindly placed at my service by 

 my friend Dr. H. Hicks, who has long since earned the right to be 

 regarded as our chief authority upon the sequence and fossils of the 

 British Cambrian deposits. 



1 Kjerulf, Die Geologic des (sudlichen und) mittleren Norwegen (Gurlt), Bonn, 

 1880, p. 61. 



'^ Kjerulf, ibid. pp. 68-69; Veiviser, Christiania, 1865, pp. 1, 2, etc. 

 * Kjenilf, Mittler Norwegen, p. 133. 



