212 CRETACEOUS ROCKS OF S. INDIA. [PaRT III. 



utilized by the natives, whose pottery (nnglazed and porous,) is made 

 Chatty (native pot) chiefly from sandy ferruginous clay,s, which occur 

 ^^'^•^' • at one or two places in the superficial deposits. I 



have met with this latter overlying the plant beds between Terany and 

 Kauray, close to the old Trichinopoly road, and also covering the Cretace- 

 ous rocks on the slope of the high ground to the South-east of Vemmany 

 (North of Arrialoor). At both these places it is collected by the native 

 potters of the adjoining villages. The former is a very ferruginous plastic 

 clay, the latter less ferruginous and sandy, but sufficiently plastic to work 

 on the wheel, without difficulty, when well kneaded. Either would answer 

 well for brick-making, or the manufacture of common red pottery. 

 The Vemmany clay is a somewhat argillaceous form of the common 

 red soil of the country, and probably an equally good material 

 mio'ht be obtained from several parts of Wodiarpolliam, where this soil 

 predominates. 



A fine pipe clay occurs in the plant beds between Terany and Kauray, 



forming a thick bed which is exposed in one of the 



Pipe c ay. small feeders of the Terany tank, about a mile and 



a half to the North-east of the village. The clay is a greyish white clunch, 



with a few stains of iron, but were a pure clay required, the stained parts 



might be easily separated by hand picking. This clay, when ground 



and kneaded, works well, and when burnt assumes a blueish white tinge. 



Another fine clay, somewhat more sandy than the above, but highly 



plastic, is that which underlies the Reptilian bone 

 Fine feiTuginoiis clay. , o. i ,-kt ^ 



beds to the East of Ootacoil and Coothoor (JNorth- 



east of Arrialoor). One or two thick beds (containing casts of small 

 fossils) are exposed in the nullahs to the North-east of the latter village. 

 This clay is of a greenish grey tint, and occurs broken up into small 

 angular fragments. It requires grinding for use, but is very plastic, and 

 when burnt assumes a pale reddish-brown tint, owing to a small propor- 

 tion of iron. 



