262 Frof. Lapicorth — Palceozoic Eoeks of Britain 8f Scandinavia. 



well-known Alum Schists) of calcareous and pyritous flagstones and 

 shales, passing up conformably into the basal beds of the succeeding 

 Ordovian System, with its distinct fauna. But, while in the typical 

 British area of St. Davids, the Lower, or sandy division of the Cam- 

 brian, contains examples of the genus Paradoxides in all its higher 

 zones, the homotaxeous arenaceous rocks of Scandinavia show no 

 trace whatever of the presence of that conspicuous fossil. It is, how- 

 ever, present and abundantly prolific in the lower half of the succeed- 

 ing Ahim Schist division. Hence it has been contended by Linnarsson 

 that the Alum Schists represent the whole of the British Trilobite- 

 bearing Cambrians, and that the underlying sandy strata answer to 

 the barren basal beds below. By Dr. Hicks, on the contrary, it 

 was believed that none of the Alum Schists are of greater antiquity 

 than his Menevian Group, and that the Swedish sandstones represent 

 merely the highest zones of his arenaceous Harlech Eocks. For my 

 own part, though I suspect that the deep-seated Annelide-bearing 

 sandstones of the Cambrian in both regions are merely rapidly 

 deposited arenaceous bases to the slowly accumulated Paradoxidian 

 Eocks which overlie them, and thus of slightly different geological 

 ages in different localities, I shall here conventionally group them 

 together under the general title of Annelidian or Scolithian. 



The Cambrian Eocks of Scandinavia have been subdivided as 

 follows : 



Sweden (Linnarsson, etc.).' 



V. DiCTYONEMA ScHISTS, with Bic- 



tyonema flabelliforme, Eichw. 



IV. — Olenus Schists (Upper Alum 



Schists), with Feltura scarabeoides, 



etc , in the npper zones, and Olenus 



gibbosus,'WaM.., and Agnostiis pisi- 



formis, Linn., in the lower. 



III. — Paradoxides Schists (Lower 

 Alum Schists), with Paradoxides 

 Forchhammeri in the highest beds ; 

 Far. F)avidis, Salt., and F. Hicksii, 

 Salt., in the middle ; and Faradox. 

 Kjerulfi, Linrs., in the lower zones. 

 II. — FucoiD Sandstone, with Fucoids 

 (Annelides) and Lingulella ? 

 I. — Eophyton Sandstone, with 

 Fophytou, Cruziana (Annelides), and 

 Obolus ? 



JSToRWAY (Prof. Kjerulf).'* 



Primordial Formation (Kjerulf). 

 II. — Olenus Etage (Alum Schists), 

 with Fictyonema, Feltura scara- 

 beoides, "Wahl., Olenus gibbosus,W., 

 Agnostus pisiformis, Linn., etc. 



I. — Paradoxides Etage — 



\d. Upper Paradoxides Niveau, with 



Faradoxides Forchammeri, Ang. 

 \c. Middle Paradoxides Niveau, with 



Faradoxides Tessini, Brongn., etc. 

 \b. Lower Paradoxides Niveau, with 



Faradoxides Kjerulfi, Linrs., etc. 

 la. Sparagmite formation, without 



fossils.^ 



Basal Cambrian Sandstones (Annelidian) of Sweden. — The Annelide- 

 bearing Sandstones which lie at the base of the Cambrian System 

 of Sweden are arranged by the officers of the Swedish Geological 

 Survey in two main divisions — the Eophyton Sandstone and the 

 Fiicoid Sandstone. The first of these reposes, with a strong un- 

 conform ability, upon the underlying Archaean, and is succeeded 

 conformably by the second, which graduates conformably in its turn 

 into the overlying Paradoxidian zones. 



' Linnarsson, Geol. Mao. 1876, p. 241, etc. 



2 Kjerulf, Die Geologie des Mittlereu Norwegen (Bohn), 1880, p. 56, etc. 



'• Kjerulf, ibid. p. 145. 



