Page 112 - Carbonate Sedimentology and Sequence Stratigraphy

CHAPTER 6: FUNDAMENTALS OF SEQUENCE STRATIGRAPHY
Exxon
My
Ties with Exxon column
events correlated within 0.5 My
events differing by 0.5-1 My
events differing by > 1 My
103
Fig. 6.22.— Comparison of the
sequence-stratigraphic sea-level curve
with paleoceanographic indicators of
temperature and ice volume derived
from ODP site 747. A) Red: sea-level
18
curve of Haq et al. (1987). B) δ O
seawater a proxy indicator of global sea
level derived from paired measurements
18
of Mg/Ca ratios and δ O of benthic
18
foraminifera. C) δ O curve measured
directly at site 747. Overall similarity
of the curves as well as coincidence
of many single events suggest that
glacio-eustatic sea-level fluctuations
were a dominant control of the sequence
record in the past 30 My. After Billups
and Schrag (2002).
Fig. 6.23.— Correlation between the
Exxon sea-level chart (Haq et al., 1987)
and four synthetic stratigraphic columns
constructed by random-number genera-
tion. Horizontal lines represent bound-
aries of sea-level cycles drawn at the
time of most rapid fall. Degree of cor-
relation is high; even in the worst case,
i.e. column 3, 77% of the cycles corre-
late with the Exxon column by a margin
of less than 1 My. After Miall (1992).