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Stratigraphic cycles
Stratigraphic cycles refer to the transgressive and regressive sequences bounded by unconformities in the stratagraphic record on the cratons. These cycles represent a large scale eustasy cycle since the Cambrian period with further sub-divisions of those units. 〔Sloss, L.L., (1963). "Sequences in the Cratonic Interior of North America." ''Geological Society of America Bulletin''. 74: 93-114.〕
==Divisions==
The division of these sequences were originally constructed in the Appalachian Basin and Cordilleran Basin of North America. Eventually these sequences were correlated in Russia and South America.〔Prothero, D.R., and Schwab, F., (2004). ''Sedimentary Geology''. W.H. Freeman, New York: 323.〕 The transgressive-regressive units show gaps in the rock records which indicate times of continual erosion and very little deposition. Local tectonics did not play a role in these global events, rather, a worldwide rise and fall of sea level.
Smaller orders in stratigraphic cycles have also been proposed. Fifth-order cycles and sixth order cycles have also been described in much of the Absaroka sequence. The time scale is much smaller and instead of Wilson cycle controlled sea-level change, these shorter cycles were controlled by glaciers (also called glacio-eustasy).〔Busch, R. M., and Rollins, H. B. (1984). Correlation of Carboniferous strata using a hierarchy of transgressive-regressive units. Geology, v. 12, p. 471-474.〕 〔Anderson, E.J., and Goodwin, P.W., (1980). Application of the PAC hypothesis to limestones of the Helderberg Group. Society of Economic Paleontologists and Mineralogists, Eastern Section Guidebook, p. 32.〕
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