shankargallery (shankargallery) wrote,
shankargallery
shankargallery

EXAMINING THE HIMALAYAS

   The theory of plate tectonics
estimates that the Indian sub-continent has moved 4,400 kilometers northwards
since the close of the Mesozoic era, 140 million years ago. About the Middle
Permian or more than 200 million years ago, an extensive sea stretched
along the latitude presently occupied by the Himalaya. Into this geosynclinal
sea known as the Tethys (daughter of the Ocean) was depostited vast quantities
of sediments from the northern Angara (Eurasian) and southern Gondwana
(Indian) land mass. The Initial mountain building process started seventy
million years ago when the Gondwana plate and Angara plate began to converge
and collide. The sea-bed was folded and raised into longitudinal ridges
and valleys. This Upper Cretaceous uplift was the first spasm of Himalayan
orogeny.
EXAMINING THE HIMALAYAS
by: Claire Zimmerman
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