Reviews — M. W. Kilian — Structure of the Alps. 567 



intrusive granulite and tlie graphitic quartzite is represented by 

 carbonaceous quartzites and phtanites. These rocks underlie the 

 phyllades de St. Ld, and pebbles of them are found not only in the 

 Cambrian but also in pre-Cambrian conglomerates. The carbonaceous 

 phtanites of this horizon occurring at Lamballe (Cotes du Nord) 

 contain radiolarian remains which have been identified by M. Cayeux 

 as belonging to the group of the Monosphaeridse. These are the 

 oldest fossils known in France, and probably in the world. The 

 discovery is also interesting because it confirms the theory of M. 

 Michel-Levy as to the origin of the granulitic gneiss. 



la E V I S ^W S. 



I. — Notes suk l'Histoire et la Structure geologique des 

 Chaines Alpines de la Maurienne, bu Brianconnais, et des 

 Eegions adjaoentes. Par M. W. Kilian. Bull, de la Soc. 

 Geol. de France. 3eme s., vol. xix (1891), pp. 571-661. 



SuR l'allure tourmentee des Plis isoclinaux dans les Montagnes 

 DE la Savoie. Par M. Kilian. Ibid. pp. 1152-1160, pis. 

 xxv.-xxvi. 



HE first of the above papers contains the results of a series 

 of explorations carried out by M. Kilian, on behalf of the 

 Geological Survey of France, in a portion of the French Alps 

 between the upper valleys of the Isere, the Italian frontier, and the 

 upper valley of the Ubaye, and they are published in advance of a 

 more complete monograph on the subject. The author's researches 

 have been mainly devoted to the band of sedimentary deposits inter- 

 calated between the crystalline zones of Mont Blanc and of Mont 

 Rose, which are comprised in the second and third of the Alpine 

 zones of Lory, and referred to, in the recently published work of 

 Dr. Diener on the Sti-ucture of the Western Alps, as the " Zone of 

 the Briangonnais." 



The author treats first of the stratigraphical succession of the 

 region, and describes the grey lustrous schists, and the calcareous 

 talcose schists, situated beneath the Triassic deposits, which have 

 a great extension between Bardonneche, Oulx, and Cezanne (Italy), 

 as well as in the Queyras district. In the schists are beds of 

 blackish crystalline limestone, also some quartzites, and in certain 

 localities they are penetrated by numerous intrusions of serpentine. 

 Near the source of the Ubaye these rocks gradually pass down into 

 micaceous schists alternating with beds of gneiss. The lustrous 

 schists were regarded by Lory as of Triassic age, but M. Kilian 

 considers them to be Paleeozoic, possibly Carboniferous, or even 

 more ancient. 



The Carboniferous rocks of the region form the great anticlinal 

 of the third zone as well as some of the anticliuals of the second 

 zone, and above them are beds of green phyllites, grits, and con- 

 glomerates, resembling the verrucano of the Swiss Alps, which from 

 their stratigraphical position beneath the Trias are referred to the 



