Reviews — The Swiss Palceontographical Society. 279 



Glacial phenomena of the islands. Eeminiscences of the " Great Ice 

 Age " were met with on every island visited. Sometimes the stri^ 

 were finely preserved, at other times they were faint, and only the 

 deeper ruts were conspicuous upon the smoothed faces ; while in very 

 many cases all the more delicate ice-markings had disappeared, and 

 only the characteristic rounded and dome-shaped outlines remained. 



The Till or Boulder-clay, not often so much as 15 feet in thick- 

 ness, closely resembled the similar deposit which occurs in the hilly 

 and mountainous districts of Scotland. It lay either upon low 

 undulating grounds, or was closely packed together behind rocks, 

 whose abraded and ice-worn faces were quite destitute of any such, 

 covering. All the stones and boulders in the Till were of local 

 origin, and in the many exposures which were examined, no fragment 

 which might not have been derived from the islands themselves was 

 found. All consisted of basalt rocks and tuff, and chiefly of the 

 former. This Till, in the author's opinion, represents the ground- 

 moraine of the old ice-sheet that covered the islands. 



All the little lakes, with one or two exceptions, were found to 

 occupy true rock-basins, excavated by ice-action under varying 

 conditions. 



To many interesting matters we must but briefly allude under the 

 headings of the "Origin of the Valleys and Fiords," "Atmospheric 

 Erosion," "Former Greater Eainfall," "Marine Erosion," and lastly 

 "Peat and Buried Trees" — all of which, besides other subjects, are 

 treated more or less fully, according to the information he could 

 gather, and always in the lucid and graphic style so characteristic of 

 the author. 



The memoir is illustrated by a map and three plates of sections. 



12, IE AT IIE ^vV S. 



The Swiss Pal^ontographioal Society. 



MONOGRAPHIE PaLEONTOLOGIQUE DES CoUCHES DE LA ZoNE I 



Ammonites tenuilobatus d'Oberbuchsitten et de Wangen 

 (Soleure). Mem. de la Soc. Pal. Suisse, vol. vii. 1881. 



THE indefatigable M, de Loriol has recently completed the above 

 monograph, though it is not quite four years since there 

 appeared a notice in the Geol. Mag. (Aug. 1878, p. 354) of a similar 

 monograph by the same author of these very " Badener Schichten " 

 as they occur in the adjoining Canton of Argovie. 



At the risk of being charged with forcing an open door, M. de 

 Loriol is not satisfied with a simple comparison of the zone in the 

 two localities, such as mere statements or lists of fossils might con- 

 vey ; but he devotes a full palaeontographical memoir to the subject, 

 embracing about 87 species, many of which were amply figured and 

 described in the previous monograph. 



Fourteen fine quarto plates of fossils with text are given in the 

 best style of the Swiss Palgeontographical Society for the benefit 

 of those who are not satisfied by a simple examination of the table 



