148 CRETACEOUS ROCKS OF S. INDIA. [PaRT II. § 2. 



"Wurrawaddi.* A very small patch only is exposed, and its real extent is 



not ascertainable, owing to the covering of soil, but it is probably not very 



large. In a well in the village of Periya Wurrawaddi Cretaceous rocks 



are exposed, and in the jungle around the little patch of gneiss a good 



deal of calcareous kunkury shale is scattered about similar to that which 



characterizes the base of the group at Killanur, and other places on the 



boundary. 



At Yeramamir, still farther South, a quantity of half-consolidated 



sand thrown out of a newly dug bowrie, is full of 

 Nucleolite bed. 



Nucleolites, of apparently the same species as that 



which characterizes the lower fossiliferous zone of the group in Trichino- 



poly. A few other fossils occur with it, viz. : an Ostrea, a Pectunculus, 



a Flustra-like Bryozoon, and fragments of a large Inoceramus resembling 



I. Cuvieri both in form and size. 



The higher beds are only seen at one or two places, and seem to be a 



compound of fine sands and shales, containing but 

 Higher beds. 



few traces of fossils. At Kallakurchi, the debris 



thrown out of an irrigation well, consists of soft white sandy shale, and at 

 Kalamodee, 8 miles to the Eastward, a fine white sand, with traces of plant 

 remains (apparently grass or reeds), is seen also in the debris of a well. 

 "With regard to this last, I am uncertain whether it be really Cretaceous, 

 or from the bottom beds of the Cuddalore sandstones, which undoubtedly 

 occur in situ a very short distance beyond. The rock bears most resem- 

 blance indeed to that of the Arrialoor deposits ; and within a furlong to 

 the North-east another well exposes a grey argillaceous sand not differing 

 greatly in mineral character from the above, but which the included 

 casts of fossils prove to be Cretaceous. The boundary of the Cuddalore 

 group is, however, very irregular, and resemblance in mineral character 

 unsupported by other evidence is an unsafe criterion of identity, as many 



* This is not the village of that name, marked on the map, but a village about half way 

 between the former (really Matur) and the village marked as Matur, 



