Chap. VII.] trichinopoly district — trichinopoly group. 



119 



Section East of Annapaudy. 



The little ravine to the East of Annapaudy wliich yielded the large Ammonites above-mention- 

 ed, exhibits an excellent section of about a mile in length. The 

 beds are fine grey and brown sands and sandy shales, with bands 

 of concretions, occasionally United into almost continuous beds of limestone ; the whole dip- 

 ping very regularly at angles of fi-om 6°tol0°to the Eastward, with slight variations to the 

 North and South of East. Where the little raviae joins the larger nullah, one of the limestone 

 beds is exposed very full of fossils, among which, Turritella Soiverbii, Forbes, and a small 

 Trigonia are most abundant. I found here the patatal plate of a Ftychodus closely resembling 

 that of a species common in the white chalk of' England. The higher beds between the large 

 nullah and the Arrialoor out-crop are very similar to the above ; fossils being tolerably abimdant, 

 and including many of the Garoodamungalum species, with others, such as Cyjirina, Opis, 

 &c., which do not occur lower down, but which pass up into the Arrialoor group. 



Eetuming to the lower beds at Kolokaunuttom ; on the camping ground to the West and 

 South of this vUlage three bands of conglomerate limestone crop 

 out prominently in parallel ridges, marking the bottom of the 

 group. The included pebbles are chiefly of gneiss, and their fossil contents consist of Cardium 

 Sillanum, a Pholadomya, A.starte planissima, Natica, Fhasianella ? and fossil wood. 



Again, in a large weU on the North side of the village, a very good section of these lower beda 

 is exposed, exhibiting a succession of fossiliferous sandy shales, Avith calcareous bands and 

 nodules, dipping 8° to the S, S. E. For some distance to the North of this but little is seen, 



FiG._ 15. Unconfokmity of Tkichinopoly ash Ootatoor Groups, near Ilpagoody^ 



Lower beds, Kolokaunuttom. 



