Geological Society of Stockholm, 281 



investigation, that Mount Taberg is on the whole composed of an 

 almost homogeneous rock, which has a hitherto unknown composi- 

 tion of magnetic iron-ore and olivine. 



Mr. A. Lindstrom exhibited crystals of calc-spar and quartz, 

 found in Scania in a kaolin-like Boulder-cla3^ 



III.— Meeting, March 2, 1876.— 0. F. Wsern, etc., in the Chair. 



Mr. A. E. Tornebohm spoke of the iron-ore mines of Dannemora, 

 and exhibited rock-specimens and maps and sections of the mine. 

 The ore occurs in parallel layers ; it is enclosed in crystalline lime- 

 stone, which is imbedded in " halleflinta " and " euryte," confined by 

 syenitic granite. 



Mr. Fahlcrantz exhibited maps and sections which he had made 

 of the same mine. 



Dr. N. 0. Hoist gave an account of his theory of the origin of 



o 



pebble-ridges (Kames, Eskers, Swed. "Asar"). According to this 

 theory these " asar " had been formed in the channels which the 

 water from the melting inland-ice has carved in and through the 

 ice. The material has been produced from gravel and stones, which 

 formerly were enclosed in the ice, but by the melting were swept 

 down into the channels beneath. 



Prof. Nordenskiold exhibited and described some minerals from 

 the Ural, among which was an extremely large and beautiful 

 specimen of native platina. 



Prof. Nordenstrom exhibited a model of the copper-mine at 

 Atvidaberg in the centre of Sweden. 



lY.— Meeting, April 6, 1876.— 0. F. Wsern, etc., in the Chair. 



Dr. G. Linnarsson first made some remarks on the geology of 

 Mount Omberg, in the centre of Sweden. He then referred to 

 a marine gravel-bed deposited upon a layer of fresh- water peat on 

 Gotland, many feet above the sea. In consequence of the last com- 

 munication there arose a discussion between Messrs. Torell, Weern, 

 and Nordenskiold, with special reference to the distribution of land 

 and sea during the glacial period, and whether the Baltic and the 

 Polar sea during this period had any connexion with each other 

 or not. Mr. Torell thought that such a connexion was not yet 

 proved. 



Mr. E. Erdmann exhibited some specimens of fire-clay and fire- 

 stones from Stabbarp coal-mine in Scania. A stone composed 

 of Swedish materials had for four months been heated in a por- 

 celain-kiln at Malmo (Sweden), together with a stone from Brieg 

 in Schlesien, wliich latter has hitherto been considered at the 

 porcelain-manufactory in Berlin as of the best quality known ; 

 by this test the Swedish stone showed no alteration, but the 

 Brieg stone became almost totally melted down. Mr. Erdmann also 

 described a peculiar phenomena of jointing in flint. By a single 

 blow of the hammer on a piece of flint, some parts of the latter had 

 splintered away; but exactly where the blow of the hammer had 

 acted, a regular cone had been left standing. Two specimens with 

 such cones, half an inch large, were exhibited. (See p. 288, at foot.) 



