264 Prof. LapwortJi — Palceozoic Rocks of Britain 8f Scandinavia. 



Westrogotliia, showed that the OZentts-bearing strata there actually 

 overlay the beds with Conocoryphe and Paradoxides} The same 

 fact was also subsequently demonstrated for the typical Scanian 

 localities by Dr. Nathorst,- whose contributions to this question, 

 brief as they are, are already classical in the history of Swedish 

 geology. The literature of the subject is already voluminous ; and, 

 as might have been anticipated, all the most valuable contributions 

 are from the palteontological side. Chiefest of these are the memoirs 

 of Mr. Linnarsson, the accomplished palgeontologist of the Swedish 

 Survey,^ whose every paper is a model of laborious accuracy and 

 cautious generalization; of Professor Torrel ; * of Mr. Sjogren,^ and 

 others. Within the last few months the development of the fossili- 

 ferous Cambrian deposits of the tj'^pical locality of Andrarum has 

 been summarized with great care by Dr. Sven. Tullberg, in the 

 introductory part of his most valuable memoir upon the "Agnostus- 

 species of the Cambrian succession of Andrarum." " 



[Paradoxidian Division). — According to Linnarsson the Para- 

 doxides-hesirmg strata of Sweden fall most naturally into six 

 divisions, viz. — 



6. Strata with Agnostus Icevigatus, Dalman. 



5. ,, ,, Paradoxides Forchhammeri, Angelin. 



4. ,, ,, Paradoxides olandicus, Sjogren. 



3. ,, ,, Paradoxides Pavidis, Salt. 



2. ,, ,, Paradoxides Tessini, Brongn. 



1. ,, ,, Paradoxides Kjerulfi, Linnrs. 



.With one exception (that of No. 4) all these zones are recognizable 

 at Andrarum, and judging from the elaborate tables, figures, and 

 notes given in Dr. Tullberg's recent memoir, they appear to have the 

 following local characteristics : — 



1. The lowest zone [Paradoxides Kjeridfi zone of Linnarsson) consists of about 20 



feet of schists reposing at a small angle upon the basal sandstones of the 

 region. Its deepest beds are greywacke-like schists, with Paradoxides Kjerulfi, 

 Linnrs., forms of EUipsocephalm and Arionellus, and Lingulella Nathorsti,'L\nn. 

 Next follow phosphorite-bearing limestones and alum schists, with fragments of 

 a Paradoxides resembling P. Sjogreni, Linnrs., and the zone is terminated by 

 alum schists with Agnostus atavun, Tullberg. 



2. The following zone [Faradoxides Tessini zone of Linnarsson, P. Hicksii zone of 



Torrel) has a total thickness of about 30 feet. It appears to be capable of sub- 

 division into at least three subzones, viz. — 



' Linnarsson, Bidtrag till Vestergotlands geologi, O.K. Vet. Ak. 1868. 



2 Nathorst, Lagerfolgen Cambriska formations vid Andrarum, O.K V Ak. Forh. 

 1869 ; Kambriska och Sihmska lagren vid Kiviks Esperod, etc., ibid. 1876. 



^ Compare Linnarsson, Vestergotlands Cambriska och Sikuiska aflagringar K. 

 Vet. Ak. Handl.1869; Nagra f orsteningar fran Sveriges " Primoirdialzon, " O.K.V.A. 

 Forh. 1872 ; Ofversigt Nerikes Ofvergangsbildningar, ibid. 1875 ; Brachiopoda 

 of Paradoxides-beds of Sweden, ibid. 1876 ; Fauna i Kalken med Conocoryphe 

 exsulans, Publications Swedish Geol. Survey, 1879; Fosteningarne in svenska 

 lagren med Peltura och Splicer ophthalmus, Geol. Forens. Forh. 1880, etc., etc. 



* Torrel, Petrificata suecana formationis cambricas, Lund, 1869-70. 



^ Sjogren, Anteckningar om Oland, Ofvers K.V.Ak. Forh. 1851 ; Bidrag Olands 

 Geologi, ibid. 1871 ; Nagra f orsteningar Olands Kambriska lager, Geol. For. Forh. 

 1872, etc. 



^ Publications Swedish Geological Survey, 1880. 



