THIS PPT MADE FOR GEOLOGY STUDENTS , basically Assam geology has shown

3. • TERTIARY ROCKS
• KOPILI FORMATION
• BARAIL GROUP
• SURMA GROUP
• TIPAM GROUP
• DUPITILA GROUP
• DIHING GROUP
• ECONOMIC IMPORTANCE
• QUESTION – ANSWER
• REFRENCES
INBOX

4. Closing of Mesozoic and beginning of the
Tertiary ERA some physical and Organic changes
-
• Uplifting of the Tethyan Geosynclinals
sediment and formation of Himalayan
Mountain In India Found in extra Peninsular
region.
• Occurs in Himalayan and Arakan Mountain
ranges.
Tertiary rocks

6. • In Peninsular India Tertiary rocks occur in
small patches in Western Rajasthan, along
coastal tract in Gujarat(Cutch), Orissa Kerala
and Tamil Nadu.
• The great thickness of the sediment which fill
the Indo- Gang tic plain are of Quaternary age.
• They are well developed In Sind-Baluchistan ,
Jammu-Kashmir, Simla-Garhwal and Assam
region.

7. ASSAM

9. • It is the upper unit of the Jaintia series.
• The thickness ranges from 350 to 460 meters,
but in the Upper Assam it is 800 meters.
• The formation lies over the Eocene Limestone
and underlies the Oligocene Laisong
formation.
• It is composed of Dark grey shale with
calcareous sandstone.
Kopili Formation

10. • The Barail group represents a succession of
1200meters and is of the Oligocene age.
• It rests over the rocks of Jantia group.
• Separated by Jantia-Kayang Valley.
• It is composed of the sandstones,
carbonaceous shale's and thin coal seams.
These rock beds are mostly unfossiliferous.
Barail Group

12. • The Surma Group rests unconformably over the
Barail Group.
• It has a thickness of 3000 – 6500 meters.
• Surma has marine and brackish water micro fauna
reflecting basinal deposition.
• In Upper Assam, the thickness of the rocks
reduces to 650 meters.
• The Surma group has been subdivided into two
formations :
• (i) Bhuban Formation and
• (ii) Boka Bil Formation.
Surma Group

13. • The age of this formation ranges from Upper
Oligocene to Lower Miocene.
• It is composed of 1300 to 2500 meters thick
beds of sandstones, sandy shale's and
conglomerates.
• These bed have yielded a few fossils of
Mollusca.
• The Bhuban Formation contains some Oil
bearing horizons.
(i) Bhuban Formation

14. • This formation rests over the Bhuban rocks.
• Its thickness varies from 1000 to 1500
meters.
• The Chief rock types are sandstones, shale's
and silts.
• The Boka Bit Formation has yielded a number
of fossils of Pelecypods and gastropods of
lower Miocene age.
(ii) Boka Bil Formation

15. • This group rests unconformably over the
Sukma Group.
• The Tipam Group is composed of 3000 to
4000 meters thick successions of sandstones
with subordinate shale's and clays.
• The Tipam Group has been subdivided into
two formations :
• (i) Tipam Sandstones and
• (ii) Girujan Clays.
Tipam Group

16. • The Lower parts of the Tipam Group is called
the “ Tipam Sandstones ”.
• This formation is composed of 1000 to 2500
meters thick beds of ferruginous Sandstones
with some bands of shale's and lignite.
• The Tipam Sandstones contain a few Oil-
bearing horizons. This formation has yielded
some fossil wood of lower Miocene age.
(i) Tipam Sandstones

17. • This formation rests over the Tipam Sandstones.
• It is composed mainly of mottled clays
intercalated with some beds of sandstones and
lignite.
• The total thickness of this formation is 1000 to
2000 meters.
• It has yielded some plant fossils of Lower Miocene
age.
(ii) Girujan Clays

18. • The group rests conformably over the Girujan
Clays and is of Mio-Pliocene age.
• It is composed about 3000 meters thick beds of
sandstones and clays.
• It is exposed in Central and Lower Assam. In the
Upper Assam, the Tipam group is overlain
unconformably by “ Namsang Beds ”.
• The Namsang Beds are about 800 meters thick
and composed of sandstone, grit and
conglomerates.
Dupitila Group

19. • The age of This Group is Pliocene to Lower
Pleistocene.
• It is compose of 800 meters thick succession of
Boulders and pebble beds with intercalated lenses
of soft sand and clays .
• The Dihing group has been affected by the last
phase of the Himalayan upheaval.
• The rocks often show steep dips.
• The Tipam and Dihing Groups together constitute
a successions which is equivalent to the Siwalik
groups of NW Himalayas.
Dihing Group

20. ECONOMIC
IMPORTANCE

21. MAP OF ASSAM

22. • COAL - Singrimari Coalfield, North Cachar
Hills, Khotarda
• Petrol – Digboi, Nahorkatiya, lakwa Sonai
• Limestone - North Cachar Hills, Diphu
• Cement - Guwahati
• Salt – Hailakandi , Dibrugarh

23. Indian oil of Assam

24. QUESTION – ANSWER

25. 1. Tertiary rock are found in ………………..
2. Tertiary rocks are well developed in ..….. ,
…….. , ……. & ……..
3. Barail group belongs to …………
4. Barail group topographic feature, separated
by ……..
5. Surma has …… & ……… micro fauna reflecting
basinal deposition .
OBJECTIVE

26. 6. Dihing group age is ……………..to ………….
7. Girujan clay mainly composed with ….. , …… & ….
8. Tipam sandstone composed of …… to …. Meter
thick
9. Tipam formation has yield some …….. Of lower
Miocene age.
10. Bhuwan formation bed have yield a few fossils of
………
11. The Boka Bit Formation has yielded a number of
fossils of Pelecypods and gastropods of ……….. age.

27. SHORT ANSWER TYPE
QUESTION

28. 1. Describe Barail group of Assam.
1. Surma group of Assam divided in how many
formation ?

29. LONG ANSWER TYPE
QUESTION

30. 1. Type notes on Tipam group disclose
subdivision ?
1. Describe Dupitila group an Dihing group.
1. Describe the economic of Assam.

31. • GEOLOGY OF INDIA –VOLUME 2
-R. Vaidyanathanadhan
M. Ramakrishna
• Geology of Assam - Sattam Chakraborty:
• Engineering geology – K. M. BANGAR
• www.mapsofindia.com
REFRENCES