F.L. Wehr, 1993. "Effects of Variations in Subsidence and Sediment Supply on Parasequence Stacking Patterns", Siliciclastic Sequence Stratigraphy: Recent Developments and Applications, Paul Weimer, Henry Posamentier
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Local changes in rates of subsidence or sediment influx along a basin margin will influence the stacking of parasequences and systems tracts, and can cause boundaries between systems tracts to occur at different times in different parts of a basin. Systems tracts, therefore, are not necessarily time equivalent, and easily correlated intervals, such as condensed sections or maximum flooding surfaces, cannot be assumed to be regionally synchronous. The sequence boundary can be more difficult to recognize because of its variable and sometimes subtle expression. However, it is a more reliable chronostratigraphic surface because its timing is much less dependent upon local variations in subsidence and sediment influx.