The transgressive-regressive sequence (T-R sequence ) of Embry and Johannessen (1992) is enveloped by "composite surfaces " that include subaerial unconformities and/or ravinement surfaces and their correlative maximum regressive surface s (Catuneanu, 2002). Catuneanu (2002) suggests that the "T-R sequence has more utility than the depositional and genetic stratigraphic sequence s". He indicates the "correlative conformity is replaced with the marine portion of the maximum regressive surface ." He believes that the "latter surface has the advantage of being recognizable in shallow marine settings of virtually any type of outcrop." The problem with this approach is that nonmarine and marine portions of the sequence boundary (the subaerial unconformity and the maximum regressive surface respectively) are potentially diachronous and may also be mixed with the ravinement surface.
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