CONTENTS. 



Page. 

 On the Geological structure of parts of the districts of Salem, 

 Trichinopoly, Tanjore, and South Arcot, in Madras 

 Presidency, (leing the area included on Sheet 79 of the 

 Indian Atlas). By William King, Junr., Esq., and 

 E,. Bruce Foote, Esq., Geological Survey of India 1 



Page. 



Chap. I. Introductory — General description of aroa 1 



„ II. Alluvium — Blown Sands 25 



„ III. Post- ci-etaceous rocks , 34 



„ IV. Metamorphic rocks 47 



1. Gneissose rocks — 



(a.) Varieties of gneiss 47 



(J.) Crystalline Limestone 50 



(e.) Magnetic Iron beds 57 



(c?.) Granitoid gneiss , 76 



2 . Magnesite veins and- deposits 90 



„ V. Crystalline rocks 106 



(a.) Trap dykes 106 



(6.) Granite; quartz veins 113 



„ VI. Sui^erficial deposits and soils 120 



„ VII. Changes of siu'face now in progress 140 



„ VIII. Economic Geology 145 



ArPEUDix. On the Iron ores of KunjamuUay, near Salem. 



