Eparchaean Unconformity, Tirumala hills, Andhra Pradesh
Eparchaean Unconformity, Tirumala hills, Andhra Pradesh separates the Proterozoic Nagari Quartzite from the oldest Archaean granite
representing a time gap of over 800 Ma. The unconformity is supposed to be a period of remarkable quiescence without much structural
disturbance and igneous activity in the history of earth. The contact is exposed in the Tirumala Hills, located 10 km northwest of
Tirupati town, at the 12 km point on the Tirupati � Tirumala Ghat road, Chitoor district, A.P. The Tirupati � Ranigunta loopline
connects it to the Chennai � Vijayawada main line of the South Central Railway.
Jodhpur Group � Malani Igneous Suite Contact, Jodhpur District, Rajasthan
Jodhpur Group � Malani Igneous Suite Contact, Jodhpur District, Rajasthan lies at the foot of the picturesque Mehrangarh Fort within
the Jodhpur city. The igneous suite marks the last phase of igneous activity of Precambrian age in the Indian Subcontinent. The rock
is characterised by purple to red and ash coloured laminated tuff with chocolate coloured chalcedony, dark red obsidian, purple, reddish,
buff, whitish and greyish coloured rhyolitic tuff related to ignimbrite. The contact is enhanced by the multi-coloured igneous suite in
contact with light coloured Jodhpur sandstone.
Jodhpur is situated SW of Jaipur and is well connected by State Highways. The Northern Railway Main Line and Northern Railway Phalodi
Branch passes through Jodhpur Town. Jodhpur is also approachable by air.
Great Boundary Fault at Satur, Bundi district, Rajasthan
Great Boundary Fault at Satur, Bundi district, Rajasthan is characterised by a faulted boundary between Pre-Aravallis and Upper
Vindhyans having NNW � SSE trend. It represents a zone of disruption constituted by a number of parallel and oblique faults resulting
in a step like feature. Deformed limestone at the site is worth viewing.The Great Boundary Fault is best studied at about 10 km NW of
Bundi on Jaipur Road.