I916. No. 10. THE LOWER CAMBRIAN HOLMIA FAUNA. I07 



the only fossil which is found in it — Glyptias favosa Lnrs. — in Norway 

 is apparently found in the zone with Stremiella Liwiossoni, it could also 

 be compared with this upper zone in our lower Cambrian. No clear com- 

 parison will be obtained thereby with the Holmia Kjertilfia zone. This is 

 not improbable, as there are signs of a break both under and above the 

 Lingulid sandstone (conglomerate layers). 



Outside the classical regions we have discussed here, the lower Cam- 

 brian deposits are shown in a number of places in Sweden, but as a rule 

 in such imperfect profiles, that is it not possible to pronounce definitely 

 on their exact age. 



Sandstone resembling Lingulid sandstone is thus found both in Øster- 

 gotland and in Nerike, to some considerable extent. Gavelin ^ found 

 remains of Mickicitzia sandstone at \'änern in Dalsland filling the fissures 

 in the archean rock. 



In the north-west part of Dalarne \Knallarne and Lomviken) and in 

 Norway at Tryssil (Engerdalen I sandstone has been found in a few places 

 with Torellella laevigata. In these cases it is doubtful whether we have to 

 do with deposits corresponding with the MickwUzia sandstone or with basal 

 conglomerates with Torelella, which laN'ers were in Sveden deposited during 

 the middle Cambrian transgression. Probably the latter view is correct, for 

 the southern part of Dalarne, where the Cambrian is completely lacking, 

 mav be taken to have formed a part of the Southern Scandinavian conti- 

 nent in the lower Cambrian period. 



From Dalarne northwards to Torneträsk discoveries are mentioned of 

 the Lower Cambrian age from various places, sometimes with Holmia 

 Kjerulfi, sometimes with Hyolithus. Probably these Hyolitlnis shales 

 represent about the Holmia Kjerulfi zone, and lie over older sandstone (Norr- 

 botten.) 



At Torneträsk we have for the first time a more complete profile, 

 which was made public by F. Chr. Moberg - and roused great interest. 

 Here we have lower Cambrian strata about 80 m. thick. In the lower 

 part there is green and red clay with Platysolenites antiquissiiuus, in the 

 upper part a gre}' fossiliferous shale, which Moberg compares with the 

 Holmia Kjerulfi zone. 



The Platysolenites zone must be compared with the Mickivitzia sandstone 

 in Estland and southern Sweden and with the Discinella Holsii zone in 

 Norway, the upper fossil zone with the zone with Strenttella Linnarssom' 

 in my opinion, and not with the Holmia zone. Holmia Kjenilfi is missing, 



* A. Gavelix. Om underkambr. sandstensganger vid västra stranden af Vânern, 1909. 

 - Bidrag til Kânnedomen om de Kambr. lagren vid Tornetræsk, (1908). 



