98 JOHAN KIÆR. M.-N. Kl. 



shales and pass over into a black shale, that at the bottom contains thin 

 layers of blue limestone with fragments of fossils. Brøgger reports from 

 this place the remains of an indeterminate species of Paradox'xdes, and 

 also Acrotreta and Lingiila. This lowest fauna in the black shale is worthy 

 of closer study; during a visit in 191 5 material was gathered, although I 

 did not succeed in finding determinable remains of the Paradoxides form. 

 To judge from one or two fragments it appears, hower, that even here we 

 have Paradoxides Ølandicus. Remains were also found of a tiny Lingu- 

 lella cf Nathorsti Walc. Thus is it probable that the Ølandicus zone, 

 which in this district introduces the Middle Cambrian, commences as early 

 as in these beds. 



After a covered portion we again find black grey shales with large 

 flat ellipsoids and layers of fine, light blue-grey limestone, that weather 

 with a yellow colour. We quite commonly find remains oi Paradoxides Ølan- 

 dicus Sjögren, with small brachiopods, of which we must specially mention 

 Acrotreta Schmalensei Walc. Brogger also notifies from this place Cono- 

 coryphe sp. Agnostus parvifrons Lnrs., Agn. planicauda Ang., Agnostus 

 Nathorsti Brog and Obolella sp. (?). Also remains of Paradoxides Sjögreni 

 Lnrs. have been found. 



Above the zone with Par. Ølandicus there succeeds, as indicated by 

 other sections, the zones with Par. Tcssini and Forchhammeri, exactly as 

 in the central part of the Christiania area. 



The Ølandicus zone is then superimposed by Quartz sandstone of 

 considerable dimensions, but in my opinion this may be explained as due 

 to folding and faults, and does not indicate the original position of the 

 beds, as assumed by Brøgger in his paper. 



This important profile thus shows that the Lower Cambrian grey green 

 shale series passes with regular transition to the Middle Cambrian zone 

 with Paradoxides Ølandicus. From a faunistic point of view, however, 

 there appears to be a somewhat sharp line of distinction, if we except the 

 occurrence of the little Lingulella cf Nathorsti Walc. in the lowest 

 bed of the Ølandicus zone. The form in fact is typical of the Swedish 

 Lower Cambrian, 



The occurrence of a true transition fauna in certain beds, however, is 

 shown by the interesting discovery that was made by v. Schmalensee in 

 1900. This excellent collector, who made collections in that year for our 

 museum, found at Tomten pieces of a bed of somewhat light grey lime- 

 stone, apparently lying in black shales. This bed of limestone, which 

 according to v. Schmalensee apparently belongs to the Ølandicus zone, 

 contains the following forms: 



