318 Prof. Lapworth — Palceozoic Rocks of Britain 8^ Scandinavia. 



seqiience and that of Andrarum was demonstrated by Nathorst in 

 1876.^ 



The Hardeberga Sandstone is fomid also in the island of Bornholm, 

 and the Paradoxidian zones of P. Tessini, Par. Davidis, and Par. 

 ForcMammeri, each zone agreeing in position and in fossils Avith its 

 counterpart at Andrarum.'-' In Westrogothia, the basal Sandstones 

 and the Alum schists are both well developed. The former include 

 both the Eophyton and Fucoid sandstones, and the latter their two 

 natural divisions of Paradoxidian and Olenidimi.^ Even as early as 

 1876/ before the correct sequence of the Andrarum fossils had been 

 ascertained, Linnarsson recognized the following palseontological 

 subdivisions in the Alum schists of this region." 



a. Upper Groups, Regio OUnorum {Olenidian). 

 Division 6, with Oleuus {Peltura) scarabeoides. 

 ,, alatus. 

 Division 4. Beds with Olemis latus, Olemis [FarahoKna) s2miulosus, "Wahl., 

 Agnostus pisiforniis, Linn., and Oleiius gibhosus, AVahl. 

 J). Lower Groups. Eegio Conocorypharum {Paradoxidian). 



Division 3. Beds with Liostracus co&tatus, Aug., etc., Agnostus Icevigatus, 



Dalm., Orthis and Lingula. 

 Division 2. Beds ^I'^Paradoxides Forchhammeri (?), Arionellus difformis, Ang., 



Anomocare sp., Coiiocoryphe, and Obolella. 

 Division 1. Beds with Faradoxiden Tessini, Liostracus aculeatus, Aug., Agnostus 

 parvifrons, Linn., A. gibbus, Linnrs., A. faliax, Linnrs. 



Divisions 6 and 4 correspond most distinctly to the zones of 

 Peltura scarnheoides (b), and Pardbolina spimilosa (4), of the Olmidian 

 of Andrarum ; and Divisions 3, 2, and 1 to the Paradoxidian zones 

 o^ Agnostus IcBvigatus (5), P. Forchhammeri (4), and Par. Tessini (2) 

 of the same locality. 



The same three divisions of Paradoxidian are recognizable also in 

 Nerike,^ where they are likewise underlain by the usual basal sand- 

 stone formation with Scolithus, etc. The Olenidian of Nerike has 

 also the Westrogothian facies, the upper portions affording Peltura 

 scarabeoides, and the lower Parabolina spinulosa and Agnostus pisi- 

 formis, etc. 



The Paradoxidian zones P. Tessini, P. Forchhammeri, and Agnostus 

 Icevigatus are found locally in Jemtland, and Ostrogothia.' 



In the Island of Oland the Cambrian Eocks have been carefully 

 worked out by Sjogren,* and their fossils studied by himself and 

 Linnarsson.^ Three zones are recognizable in the Paradoxidian of 



' Nathorst, Kamhriska och SUuriska lagren vid Kiviks Esperod, Geol. For. 

 Fbrhandl. 1876. 



2 TuUberg, Agnostidce of Andrarum, table 3, p. 10. 



2 Linnarsson, Vestergotlands Cambriska och Silm-iska Aflagringar, Stockholm, 

 1869. 



* Linn. Nagra forsteningar Vestr. sandstenlager O.K.V.A.F. 1869. 

 ^ Linnarsson, op. cil. p. 41. 



^ Linnarsson, Ofvers Nerikes Ofvergangshildningar, O.K.V.F., Stockholm, 1875. 

 ■^ Linnarsson, Brachiopoda Faradoxides Beds, p. 6. 



* Sjogr., Anteckningar om Oland, Ofv. K.V.A.F., 1851 ; Bidrag Oland's Geologi, 

 ibid. 1871 ; Nagra forsteningar Olands Kambriska lager, Geol. For. Forhl. 1872, etc. 



3 Linnarsson, Geol. For. Forhl. Bd. II. p 79 ; Geologiska iakttagelser p& Oland, 

 ibid, 1875; Brachiopoda Faradoxides Beds, 1876. 



