I06 JOHAN KIÆR. M.-N. Kl. 



in fossils and 24 meters thick. I am also inclined to adopt Moberg's 

 parallelization, in which he places the Lingulid sandstone, and the Holmia 

 Kjerulfi zone side by side. We thus have the Mickzvitzic sandstone placed 

 parallel to the Discinella Holsti zone, a classification that is confirmed by 

 the circumstance that in Norway this zone contains Medusina sp. and Vol- 

 borthella tenuis, the latter of which was first described from the Mickivitzia 

 sandstone in Estland. 



According to this, our sandstone shales should be somewhat older, 

 which also appears to agree with Moberg, who regards the oldest sand- 

 stone in Skåne as older than the Michwitzia sandstone. 



In Estland^ it appears that one can with tolerable certainty compare 

 the Mickivitzia sandstone, with its interesting fauna, with our zone with 

 Discinella Holsti^ with the Miclnvitzia sandstone in Vestergötland, and the 

 Torelli zone in Skåne. The 10 m. thick Fucoid sandstone should accor- 

 dingly be comparable with the Holmia Kjerulfi zone. This, however is 

 less certain, as no fossils are found, and because above it there is a huge 

 break. There is, as is known, a superstratum of the ordovicic Ungulit sand. 

 (i. e. Dictyograptus zone.) 



Under these formations lie the blue cla}' and the oldest sandstone, 

 which, rest directly upon the archean rocks. The thicknes is considerable, 

 up to about 200 m. Their age cannot be fixed otherwise than by regar- 

 ding them as older than the oldest lower Cambrian deposits in the south 

 of Sweden, and probably older than the oldest marine deposits in central 

 Norway. 



According to this survey, we have found neither in the south of 

 Sweden nor in Estland anything which can be compared with our upper 

 fossiliferous zone in the lower Cambrian (zone with Strcnuella Litnarssoni). 

 It is however possible that J. C. Moberg's " zones 3 — 4 at Andrarurn be- 

 tween the grey-wacke shale with Holmia Kjerulfi (zone 2) and the fragmen- 

 tary limestone (zone 5) which is compared with the Par. Ølandicus zone, 

 may be contemporary formations. As the brachiopods which these zones 

 contain have not been exactly described, it is not yet possible to pronounce 

 definitely on the point. 



In Vestergötland, as stated, it is more difficult to determine the state 

 of affairs. The comparison given above, as Moberg also maintains, is not 

 certain, particularly in my opinion as regards the Lingulid sandstone. As 



1 F. Schmidt. Über eine neuentdeckte untercambrische fauna in Estland (Mem. L'acad. 

 imp. St. Petersb. Bd. 36, 1888). 



2 Guide to the principal Silurian districts of Scania. (Livret Guide des excurs. en Suede 

 du XLe congr. geol. intern. 1910, No. 40.) 



