C.IAP. VI.] SUrEllFICIAL DEPOSITS AND SOILS. 131 



part of South Arcot. This spread^ or, to speak quite correctly, this series 

 of closely contiguous spreads of generally dark black cotton soil, occupies 

 Regur north of the ^^® greater part of the open country between the 

 ^^"*"'*' Vellaur river on the south and the Kullakurichi 



river on the north. On the west the cotton-soil stops short a few miles 

 east of the mouth of the Ahtoor Pass, and on the east it dies away or 

 passes imperceptibly into the old alluvium of the valley of the Vellaur 

 and Munnimootaur rivers. 



In the neighbourhood of Volcondapuram, there are some extensive 



spreads flanking the north-east side of the Patcha- 

 near Volcondapuram : n rm 



muUay. Ihese spreads were no doubt once conti- 

 nuous with those covering the cretaceous rocks, as well as with those 

 lying between the EUayaur and Vellaur rivers and the great spreads north 

 of the latter river. 



Cotton-soil is further found to the south of the Patchamullays, where 



there is a large spread immediately south and west 

 near Chettycolum : n r^i , , 



01 Chettycolum. 



In the Toriore valley (Trichinopoly district), between the Kolymullays 



and Patchamullays, Eegur occurs in several 

 in Toriore valley : i , i i i i i / i t^ 



detached and rounded patches near Devaruppun- 



putty, about 3 miles north-west of Cunnanoor, at Okaray and Ban- 



draputty, 4 or 5 miles south of Oopillipooram, and at Amahputty, 3 



miles south of Toriore. 



East and north of the Tullamullay are several 



roimd TuUamullay ; j j. • 



well marked spreads oi moderate size. 



West of Namcul, in Salem district, we meet with 



nearNamculj ., i p /-i . , -i 



a small spread oi Cotton-soil. 



South-east and east of Adamancotta, at the south end of the Bara- 



mahal terrace, at an elevation of between fourteen 



in the Baramahal ; inn. ijjri.i. ii j j 



and fifteen hundred leet above sea level, and around 

 Darmahpoor, are several good-sized spreads of typical Cotton-soil, 

 especially to the north of the road from Darmahpoor to Pennagrum. 



(353) 



