Geology Reference
In-Depth Information
( Contd .)
Geologic Age
Stratigraphic Unit
Rock Formation
States/Hydrogeological Characters
Semi-consolidated Formations
Tertiary
(a) Nummulitic Shales and
Limestones
(b) Carbonaceous Shales
(c) Sandstones
(d) Shales
(e) Conglomerates
(f) Ferrugineous
(g) Sandstones
(h) Calcareous Sandstones
(i) Pebble Beds
(j) Boulder-Conglomerate
(k) Sands
(l) Clays
(a) Boulder-Pebble Beds
(b) Sandstones
(c) Shales
The hydrogeological potential of these formations is
relevant only in the valley areas. Lower Siwaliks and
their equivalents in Himachal Pradesh, Jammu and
Kashmir, Assam, Punjab, Haryana, Uttar Pradesh and
Sikkim generally do not form potential aquifers.
The Upper Siwaliks have moderate groundwater potential
in suitable topographic locations. Tertiary sand stones of
Rajasthan, Gujarat, Kutch, Kerala, Orissa, Tamil Nadu,
Andhra Pradesh, West Bengal and North Eastern States
have moderate to moderately good yield potentials up to
28 lps. Possess moderate primary porosity and hydraulic
conductivity.
Gondwanas
Occur in Bihar,. Maharashtra, Andhra Pradesh, Orissa,
Madhya Pradesh, Gujarat, Rajasthan and Tamil Nadu.
Upper
Carboniferous
to Jurassic
Jurrasic of Kutch
and Rajasthan
Baghbeds
Lametas and
Equivalents.
(a) Coal Seams
(b) Sandstones
(c) Calcareous Sandstone
(d) Shales
(e) Quartzites
(f) Limestones
These formations do not have wide regional distribution,
Possess moderate primary porosity and hydraulic
conductivity. Karstified limestones are good water
yielders. Friable sandstones in Barakars and Kamthis
(Lower Gondwana) and their equivalent formations
possess moderately good potential. Yield up to 14 lps.
( Contd .)
 
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