I916. Xo. 10. THE LOWER CAMBRIAN HOLMiA FAUNA. IO5 



Finally, uppermost in the Lower Cambrian, the sea penetrated during 

 a continued sinking, in this large shallow basin and deposited its sediments 

 with the remains of the oldest marine animal life with which we are 

 acquainted in Scandinavia. 



III. Parallelization with Certain Other Lower Cambrian 



Regions. 



We shall here quite briefly attempt to draw a parallel between our 

 fossil-bearing Lower Cambrian sediments and deposits in other Scandinavian 

 and certain other regions, and we will begin with the old classic region in 

 South Sweden ^ 



According to Moberg's account, we have in Skaane the lowest zone 

 with Olencllus (Scli))iidtiellnsJ Torelli, consisting of sandstone of diôerent 

 colours, lowest down with conglomerate beds lying on the archean rock. 

 The magnitude appears difficult to determine and at any rate is not stated. 

 From the upper part of this zone Moberg mentions Schmidtiellus Torelli 

 Moberg, Holniia iKjcnilfia) Liimigreni Moberg, Obolella Mobergi Walc. 

 Ob. Lindstro)ni Walc, and Hy oli thus de Gee ri Holm. Above this sand- 

 stone at several spots lies the zone with Holinia Kjendfi Lnrs. a sandy 

 shale Igrey wacke shalel of slight magnitude; at Andrarum, for instance it 

 is only 2 m. thick. 



The latter forms a distinct parallel to our Holmia shales which are 

 much richer in fossils. The lower sandstones must then be parallelled with 

 the Discinella Holsii zone, and probably also with the sandstone shales 

 containing trails, although the fauna does not exhibit forms that agree; 

 it reminds one in a faunistic sense more of our Holinia fauna (Kjernlfia 

 Liiudgreni, closely related to Kjendfia lata and Obolella Mobergi. very close 

 to Obolella rotundata). The faunae are evidently closely allied and ma\- 

 naturally be regarded as zones directly succeeding each other. 



This apparent disparity in fauna however is not very surprising in 

 these sediments that are throughout poor in fossils and often entirely 

 destitute of them. At certain places onh^ a few forms have left traces, and 

 we meet sometimes with one isolated form and sometimes with another. 



It is more difficult to make a parallel with the Lower Cambrian strata 

 in Vestergötland. where we find lowest of all the j^/V^t£;/Vs/a sandstone, 

 10 meters in thickness, which is deposited discordantly on the archean rock 

 with a basal conglomerate. We then have the Liiigulid sandstone, poor 



1 A convenient and admirable sun^ey will be found in Chr. Moberg, "Historical Stratigraph. 

 Review of the Silurian of Sweden" (Sveriges Geol. Unders. .Aarbok 1910 Nr. 1, igrii. 



