APPENDIX. 309 
quartzite (No. 1), which are the formations lying between the ridge and 
the gneiss boundary. One mineral peculiarity of the limestone bed (7) 
deserves notice however, namely, that at the upper part of the bed it 
has become very argillaceous and ferruginous in composition, and pre- 
sents the appearance of a calcareous shale mixed with partly laminated 
partly concretionary clay-iron-stone of dull red, purplish or even bluish 
color, with a red hematitic streak when scratched. These form an 
irregular capping to the low ridge here formed by the basset-edges of 
the limestone. In part this peculiar ironstone is certainly a sub-aerial 
formation resulting from the weathering of the ferruginous shaly 
limestones. It occurs largely at this part of the limestone area and in 
several other places under very similar circumstances, but invariably as 
a cap to this argillaceous limestone. Other localities for its occurrence 
are :—all about the limestone spreads north and north-east of the 
Streerunganaikdroog ; on the top of the limestone at Cautranepully 
east of the Kistnah; a little to the west of the road leading from 
Chintapilly to Madipadu diagonally across the peninsula; again and 
very largely to the east of Bojanam, on the Kistnah, twelve miles 
south-west of Chintapilly; and in the corner where the limestone is 
faulted against the quartzite of the Gudibonda hill. 
A similar ironstone formation has been formed by the weathering 
of the rather shaly upper part of limestone (/*), about a mile north- 
north-west of where that limestone is erossed by Section No. III. 
Description or SECTION No. VI. 
From the Kistnah across the Venkatayapalem Hill to the Achammapetta 
Hill, 9 miles north-west to south-east. 
Proceeding south-eastward from the Kistnah at Uddaloor, a spread 
of nearly two miles of shaly and thin compact grey limestone is 
passed over, the beds dipping at a rather low angle at first, then very 
(309. 3) 
