GEOGRAPHICAL DISTRIBUTION. 53 



the whole series lying along what appears to be a fault plane. No 

 satisfactory explanation for the peculiar structure of the material 

 presented itself when these rocks were first examined ; but near 

 Nargujoo, 6 miles further to the south-east, gradations from ordinary 

 " strain-slip cleavage " were traced into a structureless mylonite resem- 

 bling the material of the breccia near Nawadih. The phenomena near 

 Nargujoo strongly recalled the features of the so-called '' trap-shotten" 

 gneiss of South India, which has been shown to be due to mylonisation 

 of the charnockite series along dislocation-planes. 1 Even with the 

 teaching of the sections at Nargujoo, and the knowledge of similar 

 phenomena elsewhere, the breccia near Nawadih is not easy to explain 

 with confidence, for in some places it is quite 400 yards thick ; no 

 other explanation, however, at present offers itself. 



Sikkim border of Tibet. 

 Lieutenant-Colonel L. A. Waddell, I. M.S., states that mica in 

 considerable quantities is quarried near Tinki, three days' journey from 

 Giagong at the head of the Lachen valley, about six or seven miles 

 below the line of perpetual snow. 3 



BOMBAY PRESIDENCY. 



Chhota Udepur. 



The Political Agent of Rewa Kantha reports the occurrence of 

 mica-deposits in the Gabadia hills, within three miles of Chhota Udepur 

 town, which is 22 miles from Bodeli railway station on the Daboi- 

 Badharpur branch of H. H. The Gaikwar's State Railway. The 

 locality has not, however, been submitted to expert examination. 



Narukot. 



Major G. Fulljames directed attention in 1852 to the mica obtain- 

 able in the village of Dholasadra, south-west of Jambughoda and 



1 Holland, The Charnockite Series. Mem. Ceol. Surv. Ind., Vol. XXVIII, 

 1900, p. 198 et seq. 



1 "Among the Himalayas," 1899, p. 408. 



( 43 ) 



