282 Reviews — Glacier-lakes of Southern Norway. 



The silver-ores of Kongsberg naturally come in for a good deal 

 of attention ; they are associated with fahlbands; that is, bands 

 impregnated with sulphides, which originate from the Yinor diabase 

 dykes. The silver-bearing veins contain chiefly native silver, with 

 argentite, pyrargyrite, blende, galena, chalcopyrite, and pyrrhotite. 

 These veins cut across the schists and are locally enriched in the 

 fahlbands, most of the silver being concentrated at the intersections. 

 The veins are of two generations, the sulphidic brecciated quartz 

 veins being the older, while the well-known calcite-silver veins all 

 belong to the second generation, and are apparently associated with 

 the post-Silurian Kongsberg diabase dykes. The genesis of the ores is 

 discussed in considerable detail. 



XI. NoGEN' BeHEEKNTNGEE I AnXEDNING AV SETEENE I OSTERDALEN". 



By Dr. Hans Reusch. Norges Geol. Undersok, Aarbok for 

 1917, pp. 37, with English Summary. Kristiania, 1917. 

 rpHE distribution of erratics in the Osterdal, the valley of the 

 X Glommen, in the eastern part of Southern Norway, indicates 

 that during some part of the Glacial period the ice-shed lay to the 

 south of the present watershed; hence it was argued that there 

 should have been in the Osterdal great ice r dammed lakes, like those 

 that existed in Sweden and in Glen Roy. Dr. Reusch was, however, 

 unable to find any signs of the existence of this ice barrier in the 

 Storsjo region, where according to theory it ought to have been. 

 He examined the " seterne " or inland raised beaches of this region, 

 and has come to the conclusion that they were formed by summer- 

 ponds lying on the surface of valley-glaciers during the melting 

 stages; they are closely related to various eskers and side-moraines 

 of the district, and a detailed study of these relations has confirmed 

 his view. One of the figures, which are not numbered, gives 

 a remarkably fine view of an esker near Roros. This paper may be 

 recommended to the attention of students of glacier-lakes in this 

 country. 



XII. — Notes site l'Eeosion" en" Poetugal. II. Les Lapies des 

 Calcaiees atj Noed du Tage. By E. Fleuey. Comunic. da 

 Commiss. do Serv. Geol. de Portugal, torn, xii, pp. 127-274, 

 with 10 plates. Lisbon, 1917. 



IN this immensely long paper, in French, the author discusses the 

 character and origin of the peculiar denudational forms of lime- 

 stone regions comprised under the various designations of lapies, 

 chaos, rochesruiniformes, rock-pillars, Karrenfelder, Dolinen, grikes, 

 swallowholes, crevasses, and endless other names, comparing those 

 seen in Portugal with the corresponding types of the Karst, the Jura, 

 the Pyrenees, and many other regions. Since the paper runs to no 

 less than 147 pages the reviewer freely confesses that he has not 

 read it, but a cursory examination shows that it is an important 

 contribution to an interesting subject. The precise meaning of the 

 terminology employed by different authors is discussed in detail, and 

 a kind of glossary with definitions is drawn up, which should be 



