CONTENTS. 



PART i. 



The Geology of Idar State. By C. S. Middlemiss, C.I.E., F.G.S., 

 Late Superintendent, Geological Survey of India. 



Introduction ........ 



List of Formations ....... 



Aravalli System — 



Preliminary remarks ...... 



Descriptive details ....... 



Oalc-gneiss of Variali Kbed Brahma and Gohvara areas 

 Biotite-gneiss ....... 



Aplitc veins intrusive in the calc-gneiss and biotite-gneiss 

 Origin of the calc-gneiss, biotite-gneiss and aplite veins 

 Amphibolite limestone of Kherod .... 



Mundeti series ....... 



Other areas of Aravalli rocks — 



(a) Bodi area ....... 



(6) Bamanvada-Jesangpur area .... 



Delhi Quartzite Series — 



Preliminary remarks ...... 



Descriptive details ....... 



Magnesian phase, associated with the Delhi Quartzite . 



Tectonic relationship between the Aravalli 



Phyllite Series .... 



Idar Granite Granophyre, etc. . 



Quartz Porphyry 



Quartz Veins .... 



Basic Dykes .... 



Kawa Hybrid Rock 



Ahmednagar Sandstone Series 



Alluvium and Surface Deposits . 



Economic: Minerals 



Locality Index .... 



General Index .... 



and Delhi Quartzite 



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