246 



DR; J. W. GREGORY ON THE WALDENSIAN [May I 894, 



by a great thickness of brownish mica-schists, which can be seen 

 in numerous crags around Combe, Fornielli, Tignaj, and Meitre ; 

 thence they can be followed along the hills southward to Giordani, 

 and up the Gerrardo Valley. We found them from Giordani all 

 along the line of a traverse across country past Pinetti, Cervelli, 

 Conde, Travers a Mont, and Pois to Mustione. 



Fig. 4. — Sketch-map shotvhic/ the distribution of the Waldensian 

 Gneisses in the Bussoleno district. 



— Cale-Schist. 



V/fflM Mica -Schist. 



EZS3 Waldensian Gneiss. 



■ Roads. 



—..— Paths. 



Scale 



1 



luo.oou 



= '6336 inch to the mile. 



[For ' Gen-ancle' read ' Grerrardo ' ; for 

 ' cale-schist ' read ' calc-scbist.'] 



The ' central gneiss,' on the other hand, appears to have a very 

 restricted distribution, being limited to the bank stretching from 

 below Fornielli past San Basilio to below Meitre. The foliation of 

 the gneiss here strikes about due east-and-west, with a dip of 

 75° north. A second bed occurs intercalated in the schists east 

 of Giordani : it can be seen on the right bank of a stream just 

 above the village. Better exposures are seen as a line of low crags, 

 above the road from Giordani to Fornielli ; at the foot of this the 

 path turns to Tignaj, which leaves the main road just north of 

 Giordani. 



One kilometre south of this another gneiss-bed crops out on the 

 right bank of the Gerrardo Valley, opposite where E.. is marked on 

 the map. It occurs here as a bed, some 25 feet wide, which appears 

 to be a dyke ; the junction with the surrounding gneissoid mica- 

 schist is irregular : the only evidence of contact-metamorphism. 

 which we noticed is that the adjoining gneiss is garnetiferous. 



These three gneisses appear so strikingly similar in their litho- 

 logical characters that in all probability they are part of the same 

 original rock. 



