4 P- A. Øyen. 



those small gravel-pits, about two hundred mètres to the 

 west of the cottage, I made some closer research of the 

 material, in order to get out the percentage of different rocks, 

 and the probable place from which they had derived. 



The following table in some way illustrates the results 

 of this investigation, the subject of which has been the blocks 

 and stones picked out of a measured part of the gravel- 

 mass. The size of those blocks and stones has varied, from 

 that of a head to that of an egg, having most frequently the 

 size of a fist. Several ones out of the stones were glaciated 

 but the very striation had frequently disappeared, glacial 

 waters having left an unmistakable trace. Altogether 505 

 individual stones were classified. 



Out of this number, seventy two specimens were deter- 

 mined to belong to Archæan gneiss being of the usual type, 

 coloured in grey or with a reddish tint. Mica-schist and a 

 black-coloured hornblendite or augitic rock were found to 

 be represented by one specimen each of them. Besides 

 there were found two rounded stones of pure quartz, pro- 

 bably derived from a gneissic rock. We thus find seventy- 

 six specimens as derived from the schistose Archæan rocks. 



Eruptive rocks belonging to the same geological period, 

 we observe to be represented by seven specimens of gneiss- 

 granite of the usual type and colour, with grey and red- 

 dish tint. 



Then we meet with the representatives of different 

 kinds of Primordial, Cambrian, Silurian and Devonian rocks, 

 the last one of those groups being represented by specimens 

 of Old Red Sandstone. Among Primordial and Cambrian 

 rocks we meet in the front with. the grey and dark-coloured 

 sparagmite of quite the same type as that met with as con- 

 stituting extensive areas of firm rocks in the surroundings 



