The Imperial Gazetteer of India
TABLE OF CONTENTS
Comparative uniformity of life in the ocean
Want of strict contemporaneity in geological formation
Use of local stratigraphical names
Classification of Indian strata
The datum line in stratigraphy
The Olenellus zone
Pre-Cambrian unfossiliferous rocks
Fossiliferous deposits
Four resultant main groups
Archaean group
Purana group
Grouping of the fossiliferous strata
The Upper Palaeozoic break
Dravidian and Aryan groups
The Dravidian group in extra-peninsular India.
Fresh-water deposits in the Aryan group
Marine deposits in the Aryan group
II. Pre-Cambrian History of India
The Archaean and Purana eras in the pre-Cambrian history of India
The great Eparchaean break
Archaean era
Area of the Archaean rocks
Origin and nature of the fundamental complex.
Orthogneisses and paragneisses
Mixed gneisses
Chief divisions of the Archaean group
The Dharwarian system
The Purana era
Distribution of the Purana group
Lower and upper divisions of the Purana group
The Cuddapah and Kurnool systems
The Vindhyan system
The Purana group in Burma
Possible existence of the Purana group in the Himalayas
III. Cambrian and Post-Cambrian history of India
A. The Dravidian Era
The Cambrian of the Salt Range
Purple sandstone and Neobolus beds
Magnesian sandstone series and salt pseudomorph zone
Palaeozoic of the Central Himalayas
