1 91 6. Xo. lO. THE LOWER CAMBRIAN HOLXMA FAUNA. 9 



same kinds of shales, which to a varying degree contained remains of the 

 same Holmia fauna. Onlx' one oval lens of calcareous sandstone — without 

 fossils — was found. 



At Evjeviken we see clearly- exposed a horizon of shales that is not 

 the same as that at Temten. At the inner end of the ba\-, near the saw- 

 mill, there is quartz sandstone, and after a covered portion of the strand, 

 we find a little cliff of gre\'-green shales with two beds of sand}' limestone 

 about 20—25 cm. in thickness. These beds, which are parted by about 

 I m. of shales, contain a large number of trilobite fragments. Definite 

 remains are very difficult to hammer out; but by heating we succeeded 

 in separating cranidia of StrcnucUa Linnarssoni. At this place the sha'es 

 appear to be quite devoid of fossils. To the south the shales merge into 

 dark shales, and soon afterwards into ordinary alum shales witli large 

 concretions of limestone of Middle Cambrian and Upper Cambrian age. 

 The beds are greatly folded and compressed, so that it was not possible 

 to make any exact classification of zones. 



A number of pieces of a similar Stremtella limestone were found as 

 loose blocks at Toraten, both just below the old cutting, and nearer to 

 the farm. 



Similar beds with Strcmwlla limestone were discovered by Th. Münster 

 in a number of other localities of the Mjesen district; thus near the river 

 Finna in Snerting Valley, where he found the following beds: undermost, 

 red- violet shales, then green-red spotted shales and then dark green, almost 

 black argillaceous shales (in which there was a little cranidium of Holmia 

 Kjcntlfiy. At the upper part the shales contained a bed of impure, rust- 

 coloured limestone bearing innumerable fragments of fossils. A similar 

 fragmentary limestone is mentioned b}* Münster from Skartlien, from the 

 Dokka gully south of Saltstulsaeter. and from Storbækken to the east of 

 Dokfloivatn. 



This Stremtella limestone, which is often weathered into a rust-brown 

 mass, thus appears to form a characteristic horizon, which as the profile 

 at Evjeviken seems to indicate, lies over the Holmia shales with their 

 abundance of fossils. The faunistic difference between these two horizons 

 will be referred to in a subsequent section. 



The place of the Sîreftuella limestone at Tømten should therefore 

 be sought between the existing cuttings of Holmia shales and the bed of 

 Orthoceras limestone. 



However, it is doubtful whether an excavation there would be profi- 

 table, for everything seems to indicate that the beds are greatly com- 

 pressed. The distance between the fossil-bearing Holmia shales and the 



