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Memoirs of the Geological Survey of India

1933

The structural aspect of this 3rd region that is the country between the Amran range and the river Helmand comprising the valleys of the Dori the Tarnak and the Argandab is very simple. [...] It is near the contact of the trap with the limestone and of the latter with the granite that we find the auriferous quartz-veins and lead ores the latter common in many parts of Afghanistan. [...] In the Afghan area to which most of the harder (limestone and igneous'i rocks are confined sub-aerial denudation and wasting seem to be inconsiderable and as a consequence the last deposits formed by the existant rivers form but a thin plastering over the older rocks and the post-pliocene deposits beneath ; the material carried out of the rocky valleys of the Argandab the Tarnak the Helmand [...] The point (right in the profile) near the bend of the Nari river beyond which the Manchhar beds dip northwards is the centre of the section and supposing that near it the lowest beds of the Manchhar group are exposed it would give with a length of two miles and a dip of from 40° to 45° a total thickness for the Manchhars of from 6 000 to 7 000 feet. [...] Probably the whole of the ground of the Pishin and the valleys of the Dora and Tarnak rivers are composed of this group though now covered up by the hard conglomerates and gravels of the post-pliocene beds.
agriculture environment
Pages
79
Published in
India
SARF Document ID
sarf.100011
Segment Pages Author Actions
Preface
i-xi unknown view
Memoirs of the Geological Survey of India
1-60 unknown view
Backmatter
i-viii J.C Ghoush view

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