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of 2-5 sub-facies (Fig.6). The time for high frequent sub-facies development is during
deposition of the 4th member of the lower Es4 Formation, which includes at least 5 sub-
facies. Fig.7 shows the instantaneous frequency level slices of sub-layers' bottom boundary
of the lower Es4 Formation as characterized by a low frequency in the main channel in the
fan-root, a middle-low frequency in the mid-fan and a high frequency in the marginal-fan.
These results clearly reveal the paleogeographic characteristics and different temporospatial
evolution stages of sub-facies in the nearshore subaqueous fan system.
Fig. 7. The instantaneous frequency level slices of sub-layers' bottom boundary of the lower
Es4 Formation reflect the paleogeographic characteristics and space-time evolution of
different sub-layers
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