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Fig. 2.4 Lithological map of the Shivkhola watershed
Some assessments have been presented for the study area after studying the
lithology in detail (Laahiri
1973
):
1. The structural-cum stratigraphic succession can be observed in a traverse across
Tindharia-Kurseong region.
2. The
metamorphic boundary is gradational and correspond
to the passage between silvery mica-schist and garnetiferous mica-schist.
3. The metamorphites (Daling and Darjiling) disclose a well de
“
Daling
”
-
“
Darjiling
”
ned sequence of
deformation and recrystalisation.
4. The
rocks on the other hand, are mostly unaltered and these show
little metamorphism except some local cataclasis.
“
Gondwana
”
Landslide occurrences phenomena as well as landslide potentiality index value
(Table
2.2
) are very high for the lithological composition of gneiss, mica-schist and
granulitic rocks (73.07), mylonitised granite with sub-parallel thrust (61.54),
phyllite, silvery-mica-chlorite-schist, grey sericite (69.23), and slate phyllite with
quartzite, quartz-schist and greywake schist (65.52) at Lower Paglajhora, 14 Miles
Bustee, Gayabari, Jogamaya, Tindharia, Shiviter and Mahanadi due to following
reasons:
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