igi6. Xo. lO. THE LOWER CAMBRIAN" HOLMIA FAUNA. 7 



Amongst later works which are of special interest here, we nrav 

 mention : 



1. Section Map Lillehammer with text by Th. Münster ^ 



2. Det centrale Norges tjeldbygning, by K. O. Bjorl\"KKE-, and 



3. Profilet Ringsaker — Brøttum ved Mjøsen. by \". M. Goldschmidt^. 

 Special attention must be drown to the last named, which is accom- 

 panied by an excellent sketch map. 



As I am unable to add anything new of real importance, I refer the 

 reader to these works, and merely give a quite short survey of the geo- 

 logical conditions. 



To the north of the farm of Tomten, which is situated exactly to the 

 XW of Tande railway station, there extends a depression down to Mjosen 

 at Evjeviken ; to the north of this there are quartz shales and quartz sand- 

 stone, which as is known are older than the Holniia shales, with a steep 

 inverted dip. From Tomten there then runs a ridge of Orthoceras lime- 

 stone down as far as the farm of Sten at Mjosen. Between the latter and 

 the quartz sandstone are impressed the Cambrian beds, which unfortunately 

 are so badh- exposed that they can be studied at one or t\<-o places only; 

 thus the Lower Cambrian Hohnia shales are only visible at the farm of 

 Tomten and close by Evjeviken. 



At the former place we have the old and well-known localitj' for the 

 Hohnia fauna. It is a quite small cutting at the edge of the forest just to 

 the north of the farm by the side of a little road. The beds are quite 

 steep, and are exposed in a X — S direction for 5 — 6 m. only. The strike 

 is X 60° E. To the X — E up in the v,-oods, a well was dug some few 

 years age. 60 — 70 m. from the old locality. The Hobuia shales occur in 

 this, with strike E — W and dip 82° X. In addition, below Tomten to the 

 SW of the farm, the same shales were found exposed in a little well. 

 The shales there alwa3's contain the same fauna, and may be assumed to 

 belong to approximately the same horizon as the Hohnia shales ; the beds 

 in the upper well, however, appear to lie somewhat above those that occur 

 in the old cutting. 



In a fresh condition the Hohnia shales at Tomten are an almost grey- 

 blue, in a weathered condition grey-green, fine-grained argillaceous shale, 

 in which the fossils are found preserved with a characteristic rust-brown film. 

 In some layers there were found coarse, rounded quartz grains. At the 

 excavation. 4 — 5 m. of the beds were exposed; the whole consisted oi the 



1 Norges geol. Unders. Xo. 30. 1900. 

 - Norges geol. Unders. No. 39, J 905. 

 ^ Norges geoL Unders, aarb. 1908. No. 2. 



