Chap. V.] trichinopoly district — ootatoor group. 



65 



at least does not support the view which would refer the structure to 



original stratification, and is equally compatible 

 Due to shrinking ? 



with that which would attribute it to a shrinking 



in the interior of the mass, an explanation suggested by Mr. Jukes to 



account for a somewhat similar phenomenon in a coral-reef sandstone at 



Heron Island.* To this point I shall return presently, when we come to 



consider the nature and origin of the limestone formation regarded as a 



whole, and in the meantime I will briefly recount some other noteworthy 



features of the Cullygoody ridge, and recapitulate the evidence which 



induces me to regard this as coeval with the limestone of Tripatoor. 



At the Northern extremity of the principal ridge the mutual relations of 



^, ,. ,.,,,. the Trichinopoly beds, the coral-reef limestone, and 



Stratigraphical relation ^ ' 



of limestone near Cully- the boulder-bed and fossiliferous grits previously 

 goody. o i J 



adverted to (page 47), are beautifully exhibited in a 

 little nullah. A view of the locality is given in the annexed sketch (Fig. 6). 



Fig. 6. Boui.der-bed, Coral-reef Limestone and Trichinopoly beds. 

 North of Cullygoody. 



See Voyage qif the Fly, Vol. I., page 8, 9. 



