A next step in sedimentological models, following L. L. Sloss's lead (1962), is to feed in component variables. This could be tried before attempting to quantify or eliminate rates from the basic equation, shape=f(Q, R, D, M). A series of superposed clastic wedges (e.g., deltas, barriers-with-lagoons) resulting from alternating regressions and transgressions is considered. Prediction of thickness differences in transgressive and regressive beds and differences in lithology, using Sloss's basic stratigraphic model possibly can be improved by breaking down Q, R, D, M, into their lower-order sedimentary components. Q-, D-, and M-variable models and R-variable model and submodels are formulated and illustrated. Influences of variables on stillstand equilibria are discussed.

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