The S. E. P. M. [Society of Economic Paleontologists and Mineralogists] is tending to become the stratigraphic arm of exploration geology and its greatest contributions have been made through integration of individual specialties into the broad field of stratigraphy. One small part of this integration is to consider stratigraphic models which express, in a systematic form, the interaction of a defined set of variables which operate to produce an observable result. The variables are geological processes and the result is a sedimentary response; consideration is limited to terrigenous clastic sediments deposited at or near marine strand lines. The shape of a body of sedimentary rocks varies as a function of the quantity of material supplied to the depositional site, the rate of subsidence at the site, the rate of dispersal, and the nature of the material supplied. Stratigraphic models based upon these variables are shown for cratonic sources with equal subsidence for regression and transgression, linear subsidence, nonlinear subsidence, and external sources producing clastic wedges and turbidites.

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