these ppt is about Sequence stratigraphic schemes Sedimentary cycles, Rhythms and Cyclothems .

1. By,
JIHIL PATEL
Paper:509,unit:3
Roll no:07
Supervision: Dr. RAHUL G.

2.  Sequence Stratigraphy is a branch of geology,
specifically, that attempts to discern & understand
historic geology through the time by subdividing &
linking sedimentary deposits into unconformity
bounded units on a variety of scales. The essence of the
method is mapping of strata based on identification of
surfaces which are assumed to represent time lines,
thereby placing stratigraphy in chronostratigraphic
framework allowing understand of the evolution of the
earths surface in particular region through time

3.  Sedimentary environments that started out side-by-
side will end up overlapping one another over time
due to transgressions and regressions.
 The result is a vertical sequence of beds. The vertical
sequence of facies mirrors the original lateral
distribution of sedimentary environments.

4. http://www.sepmstrata.org

5.  Deeper water facies
overlie shallow water
facies.
A "deepening
upward" sequence
http://www.sepmstrata.org

6.  Shallow water facies
overlie deeper water
facies.
A "shallowing
upward" sequence.
http://www.sepmstrata.org

7.  The concept of system tract evolved to link the
contemporaneous depositional systems. System tract
forms subdivision in a sequence. Different kind of
system tracts are assigned on the basis of stratal
stacking pattern, position in a sequence and in the sea
level curve and types of bounding surfaces.

8.  It forms when the rate of sedimentation outpaces the
rate of sea level curve during the early stage of sea
level rise. It is bounded by subaerial unconformity or
its correlative conformity at the base and maximum
regressive surface at the top.

9. http://www.sepmstrata.org

10.  It is bounded by maximum regressive surface at the
base and maximum flooding surface at the top. This
system tracts forms when the rate of sedimentation is
outspaced by the rate of sea level rise in the sea level
curve.

11. http://www.sepmstrata.org

12. • During the late stage of base level rise the rate of
sea level rise drops below the sedimentation rate. In
this period of sea level Highstand System Tract is
formed. It is bounded by maximum flooding surface
at the base and composite surface at the top.

13. http://www.sepmstrata.org

14.  It forms in the marine part of the basin during the
base level fall. Subaerial unconformity for in the
landward side of the basin at the same time.

15. http://www.sciencedirect.com

16. http://www.sciencedirect.com

17.  The three controls on stratigraphic architecture and
sedimentary cycle development are:
- Eustatic sea level changes
- Subsidence rate of the basin
- Sediment supply

18. http://www.sciencedirect.com

19.  Sediment supply is largely thought to be controlled
by local climatic conditions and can vary rapidly.
 These variations in local sediment supply affect the
local and relative sea level which causes local
sedimentary cycles.

20. http://www.sciencedirect.com

21. http://www.sciencedirect.com

22.  Nature pulsates with many rhythms, small and large,
fast and slow. Their combination gives a varied curve
which, if the rhythms are incommensurable in period,
may never recur in quite the same combination.

23. • The vertical axis
represents baselevel and
the horizontal axis is
time.
• Combination of three
curves of different
wavelengths and
amplitudes into one
composite curve.
http://www.sepmstrata.org

24. • The curve, to correspond to nature, should be
imagined as less regular and with more orders of
rhythm.
• Another method [of investigation] is that of the
detection of rhythms in parts of the sedimentary
series, and the correlation of these rhythms with
known climatic cycles.
• Many small oscillations and some of even larger
magnitude are, however, dependent upon climatic
change.

25.  In geology, cyclothems are alternating stratigraphic
sequences of marine and non-marine sediments,
sometimes interbedded with coal seams.
 Historically, the term was defined by the European
coal geologists that worked in coal basins formed
during the Carboniferous and earliest Permian
periods. The cyclothems consist of repeated
sequences, each typically several meters thick, of
sandstone resting upon an erosional surface, passing
upwards to pelites (finer-grained than sandstone) and
topped by coal.

26. http://www.sciencedirect.com

27.  Introduction of sedimentology by Sen Gupta
 http://www.sepmstrata.org
 http://www.sciencedirect.com