4 LINNARSSON, BRACHIOPODA OF THE PARADOXIDES BEDS. 



which must consequently be the cider of the two regions. ^) I 

 also endeavoured to show that the regio Conocorypharum, thus 

 defined, might in Westrogothia be divided into three subdivi- 

 sions, and that of these the middle one was equivalent to Ak- 

 GELra's typical regio Conocorypharum, -) which is identical to the 

 "Andrarum limestone" of his geological map of Scania, the two 

 others hav ing been referred by him to his regio Olenorum. Con- 

 sidering, however, that. wherever the Primordial zone occurs in 

 Sweden, Paradoxides is the most characteristie genus of its 

 lower portion, of which Professor Angelin's regio Conocorypha- 

 rum is, in its original sense, only a subdivision. I have låter 

 proposed to use the name Paradoxides beds, or, as schists are in 

 Sweden the prevailing rocks. Paradoxides schists ^), for the lower 

 part of the alum-schists, and of the Swedish Primordial zone in 

 general. In a similar sense ]\Ir. Barrande has pre^douslv used 

 the term Phases a Paradoxides, but the erroneous accounts given 

 by Professor Angelix of the fauna and position of the regio 

 Olenorum have led him to refer also the Olenus schists to his 

 Phases ä Paradoxides, while he correctly refers their British 

 equivalents to the Phases postérieures aux Paradoxides. The 

 three subdivisions of the Paradoxides beds of Westrogothia are 

 the foUowing: 



3. Strata with Agnostus Irevicratus. 



2. )> » Paradoxides Forchhammeri. 



1. )> )> Parad oxides Tessini. 



Soon after the Primordial succession had been worked out 

 in Westrogothia, Dr. Xathorst began his important researches 

 in the Primordial rocks of Andrarum in Scania. *) He ascer- 

 tained that the typical regio Conocorypharum, or the Andrarum 

 limestone imderlies in Scania also the Olenus beds. Besides, 

 he found, below the horizen of the Andrarum limestone, several 

 fossiliferous strata, before unknown, containing various species 

 of Paradoxides and other Primordial »enera. Professor Torell'') 



') Bidrag till Vestergötlands geologi. Öfvei's^ af K. Vet. Akad. Förhandl. 



1868. 

 ^) Om Vestergötlands Oambriska och Siluriska aflaeringar. K. Vet. Akatl. 



Handl., Bd^S, N:o 2, 1869, p. 42. 

 ') Zeitschrift der Deutschen geologischen Gesellschaft, 1873, p. 698. 

 *) See Nathoest, Om lagerföljden inom den kambriska formationen vid 



Andrarum i Skåne, Öfvers. af K. Vet. Akad. Förhandl. 1860. 

 ") Petrificata suecana formationis cambricse, Acta Universitatis Lundensis 



for 1869, printed 1370. 



