146 FOOTE: GEOLOGY OF THE BELLARY DISTRICT. 



To the west these two haematite beds are cut off short by a fault, 

 westward of which occur the beds that form the southern portion 

 of the Halakundi pass section. These beds have trended to the 

 south-east and disappear to the east of Hirdahal (Hirahal) under the 

 cotton soil as the ridge they formed dies down. 



The rocks westward of the fault are not easy to understand in 

 their correlation with those further to the east or west. Like those at 

 the south end of the Halakundi pass the haematites are rather poor in 

 quality. 



A traverse across the highest part from south-west to north- 



L . t . .... east shows the following succession of for- 



Section across the hills ° 



north of Hirdahal. mations •— 



8. Hornblende rock. 



7. Gneissoid quartzite, bluish, flaggy. 



6. Hornblendic schist. 



5. Trappoid schist, thick, 



4. Hsematitic beds. 



3. Semi-pegmatoid, bluish, reefy. 



2. Hornblendic schist. 



1. Micaceous schist, grey, greenish with flakey inclusions of decomposed 

 felspar. 

 Owing to thick soil the base is not seen locally, but at a little dis- 

 tance are outcrops of the ordinary archaean granitoid. The basement 

 micaceous rock shows in small low bluffs along the western foot of 

 the Hirdahal ridge. 



In the corner made by the Hirdahal ridge and the faulted western 



. ., end of the Nemkal haematite beds is a show of 



Green gneissoid. 



green gneissoid rock which from its position 

 appears to be of Dharwar age. Its green colour, which chiefly affects 

 the quartz, is due to copper, and gives a very beautiful appearance to 

 the rock, which has considerable resemblance to the green micaceous 

 rocks so highly valued for mealing stones by the neolithic folk which 

 had their settlements at and around Bellary. Fragments of it occur 

 frequently in the great banks of angular debris which lie along the 

 boundary of the Dharwars from the corner eastward towards Antakal. 

 ( 146 ) 



