^OLIAN FORMATIONS. .^ 95 



which a"very extensive view is obtained over the great alluvial flat to 



the north. The northerly ridge of the Sivalpatti teri continues high 



and well marked for some miles, but then sinks down with the alluvial 



plain. Sivalpatti village is incorrectly shown in the map ; it stands on 



the east side of the Up-Ar (Hoop Aur) nullah. 



The small teris at Sailagudi (Shoylagoody) on the banks of the 



Gund-ar and at Selvanallur (Mala Shelvanellor) require no special notice, 



but the Rajakapallem teri requires some attention 



Rajakapallem teri. . i i i i , i i i 



from its remarkable length and narrowness, and 



also from the fact that the colour and constituents of the sand ridge 



show that the great purity of the red sand prevails no longer as the 



source of the same is left behind more and more. The sand has become 



considerably calcareous, and a tendency to solidification by concretion 



with a calcareous cement becomes visible. The very vivid red colour is 



decreasing, and this decrease continues as the ridge is followed past 



Yeravadi to Kila Karai, while to the eastward of the Kova Kulam 



(Covacolum) creek the teri sands gradually become paler and paler, 



and finally can no longer be distinguished from the impure coast dune 



sand of the TOnitorai peninsula. The most easterly sand hill that I 



have mapped as a teri is a ridge some 4 miles south-east of Ramnad, 



the sand of which can only be termed reddish. 



The only organic remains found in connection with the teris were some 

 Fossil wood &c. in a fragments of calcified exogenous wood discovered 

 *®"- on an exposed mass of hard red loam in the hollow 



between two great sand waves on the high teri about 2| miles east- 

 south-east of Nazareth. The fossil wood was accompanied by some 

 fossil shells and casts of the living Helix viUata, the common snail 

 of this part of India. 



That the advance of the teri sands has from time to time caused 



mischief by burying fields and gardens and occa- 

 Movements of the teris. , _ 



sionally houses, is well known, but much has been 



done to check its advances by extensive planting, and much more may 



yet be done ; it may not be too much to say, that as the population 



( 95 ) 



