10 Mr. K, Bruce Foote on the occurrence of 



future explorers to explain definitively by the discovery of 

 better sections. 



The typical laterite rocks of the Red Hills near Madras,, 

 which as already mentioned yielded Implements to the 

 research of Dr. Cornish, can be regarded only as an outlier 

 of the larger and more elevated laterite areas which lie 

 between the Sattavedu and Alicoor hills and the Coast allu- 

 vium. I have myself lately had the pleasure of chiselling 

 out several well shaped and well preserved Implements from 

 the hard glazed-surfaced laterite rock occurring at the nor- 

 thern end of the Red Hills area and capping the line of 

 cliffs which occurs along the Corteliaiv north eastward of 

 Yermootapolliam, and compels the river to diverge to the 

 north for a distance of about one mile. No Implements appear 

 to occur in the gritty beds underlying the laterite conforma- 

 bly, both here and in the Manjakarney outlier If miles to the 

 N. W. The gritty beds are most probably identical with 

 those underlying the Cappers Hill laterite and called " Cud- 

 dalore Sandstones" by Mr. Henry Blanford,(l). Laterite of 

 precisely the same mineral character and appearance occurs 

 north of the Narnaveram river and may be seen resting on 

 similar grits near Ingawarpolliam and Amerumbardoo(2). 

 Besides these places typical laterite occurs at and around 

 Maderapaucum, C iinnumbaucum, Boodoor and Caradepootoor 



(I.) Note, — See Memoirs of the Geological Survey of India, Vol. IV., 

 page 165. 



(2 J Note. — Near this village are a great many so called " Corumbur 

 rings." Some of which contain Kistvaens of quarried and rudely cufe 

 laterite blocks evidently derived from the immediate neighbourhood. 

 Many others occur in the scrub-jungle to the north. Prom a small rain 

 gully running west from tkis jungly ground opposite to Roshunnugger (or 

 lioshunaveram as it is generally called,) I obtained half of a perforated 

 black stone carefully rounded and smoothed'. The stone when entire 

 was probably of oval shape and evidently of human shaping and most likely 

 eame from one of the Kistvaens, most of which have been opened and 

 plundered. 



further south near Arconum I met with a well made " Celt" lying on the 

 surface Vf-ry near to some half destroyed Corumbur rings which lie on the 



aorth side of the Corteliar opposite Tukkool (5 miles S, E. by E, of 



