GEOGRAPHY OF INDIA-MAJID HUSAIN CHAPTER-1-STRUCTURE OF INDIA 1. THE ARCHAEAN FORMATIONS (PRE-CAMBRIAN) The Archaean Era is also known as the Precambrian Period. the division of geologic time scale from the ...
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...Geography of india majid husain chapter structure the archaean formations pre cambrian era is also known as precambrian period division geologic time scale from formation earth about billion years ago to beginning paleozoic million constitutes s history term introduced by j d dana in refers oldest rocks crust evolutionary atmosphere first chemosynthesis photosynthesis life supporting and modem were developed during protozoic system are devoid any form all azoic or un fossiliferous they thoroughly crystalline extremely contorted faulted practically sediment largely intruded plutonic intrusions generally have a well defined foliated these basement complex fundamental gneisses cover two thirds peninsular region be three types i bengal gneiss occurs eastern ghats orissa khodoliles after khond tribes koraput bolangir districts stretching over manbhum hazaribagh jharkhand nellore district andhra pradesh salem tamil nadu occur son valley meghalaya plateau mikir hius thinly for identified midn...