"The whole subject is so eomplicated, that all 

 the theories submitted must be considered tent- 

 ative, and the most dogmatic assertions are those 

 which, in all probability, will ultimately prove the 

 least reliable". (Crosskey). 



ln the northern part of Christiania, and situated just south 

 of the locality which I déscribed on a former occasion in a paper, 

 "A fossil-bearing Deposit of the Mactra-niveau in Christiania" 

 (Communicated to the Society of Science in Christiania on March 

 the 14th 1913) are the brick-works of Bentse. The clay-deposits 

 delivering the material for these tile-works are at the altitude 

 of betvveen fifty six and eighty two metres above the level of 

 the sea. 



South of the Bridge of Bentse we find the Silurian schists 

 forming the base rock to be in a very prominent manner ice- 

 schratched. Roches moutonnées and glacial striæ were conspi- 

 cuously well developed giving evidence of a glacier movement 

 from NNE towards SS W only with some slight deviation having 

 been occasioned, of course, from the shifting direction of the 

 movement of the glacier that at this time protruded into a true 

 glacier bay forming the inner part of the Christiania Fiord. To 

 the north of the bridge the very same phenomena of scratched 

 rock were seen in every place in which the clay-pits were sunk 

 down to the base-rock below. 



I. Immediately overlying the scratched rock itself was a 

 deposit of bluish-grey clay containing blocks and stones and 

 fragments of molluscan shells such as, for instance. Nucula 

 tenuis, Portlandia lenticula and Area glacialis. This bottom- 

 layer, only with fragments of fossils, ought to be regarded as 



