Previous Stratigraphic Concepts and Terminology
1990. "Previous Stratigraphic Concepts and Terminology", Siliciclastic Sequence Stratigraphy in Well Logs, Cores, and Outcrops: Concepts for High-Resolution Correlation of Time and Facies, J. C. Van Wagoner, R. M. Mitchum, K. M. Campion, V. D. Rahmanian
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The sequence as an unconformity-bounded stratal unit was proposed by Sloss in 1948 (Sloss et al., 1949;Sloss, 1950, 1963). Sloss (1963) pointed out, "The sequence concept is not new and was already old when it was enunciated by the writer and his colleagues in1948. The concept and practice is as old as organized stratigraphy." Nonetheless, Sloss deservedly is given credit for developing the unconformity-bounded sequence as a stratigraphic tool. Sloss (1963) recognized six packages of strata bounded by interregional unconformities on the North American craton between latest Precambrian and Holocene deposits. He called these stratal packages "sequences" and gave them native American names to emphasize their North American derivation (Sloss, 1988). Sloss (1988) used these cratonic sequences as operational units for practical tasks such as facies mapping, although he felt that these sequences" have no necessary applications to the rock stratigraphy and time stratigraphy of extra cratonic or extracontinental areas" (Sloss, 1963). Although the concept of the cratonic sequence provided the foundation for sequence stratigraphy, Sloss's ideas had found little acceptance in the 1950s, 1960s, and early 1970s except for Wheeler (1958) and "former students and close acquaintances" (Sloss, 1988).
The next major development in the evolution of sequence stratigraphy occurred when P.R. Vail, R.M.Mitchum, J.B. Sangree, and S. Thompson III of Exxon published the concepts of seismic stratigraphy in the American Association of Petroleum Geologists Memoir26 (Payton, 1977). In a series of seminal articles these authors presented the concepts of eustasy and resulting unconformity-bounded stratal patterns applied to and
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Siliciclastic Sequence Stratigraphy in Well Logs, Cores, and Outcrops: Concepts for High-Resolution Correlation of Time and Facies
Application of sequence-stratigraphic analysis depends on the recognition of a hierarchy of stratal units including beds, bedsets, parasequences, parasequence sets, and sequences bounded by chronostratigraphically significant surfaces of erosion, nondeposition, or their correlative surfaces. This method of stratigraphic analysis contrasts with the use of transgressive and regressive cycles of strata for regional correlation of time and facies. Transgressive and regressive cycles have been used for regional correlation for at least 50 years. Recently, proponents of transgressive and regressive cycles, referred to as T-R units, for regional correlation have included Ryer (1983), Busch and Rollins (1984), Busch et al. (1985), and Galloway (1989a). Galloway (1989a) introduced the “genetic stratigraphic sequence,” which is a regressive depositional unit bounded by transgressive surfaces. Although he did not define it specifically, he described it as “a package of sediments recording a significant episode of basin-margin outbuilding and basin filling, bounded by periods of widespread basin margin flooding.”