Changes

==Nomenclature problems==

==Nomenclature problems==

These scale differences result in nomenclature problems. The High Island–East Breaks shelf-margin delta (Figures 4-19, 4-21) fits a type 2 sequence criterion of Vail and Todd<ref name=ch04r100 />) because it represents a lowstand prograding complex at the same position as preceding shelf-edge depositional breaks. As such, this lowstand is part of a type 2 depositional sequence and would be called a shelf-margin systems tract. If the criteria of Van Wagoner et al.<ref name=ch04r70 />) are used, the High Island–East Breaks shelf-margin delta would be called a type 1 lowstand prograding complex because the preceding shoreline break is tens of miles further north on the Texas shelf. Clarification of such scale-dependent reference points is critical to effective communication through the careful selection of precise labels for elements of depositional sequences.

These scale differences result in nomenclature problems. The High Island–East Breaks shelf-margin delta (Figures 4-19, 4-21) fits a type 2 sequence criterion of Vail and Todd<ref name=ch04r100 />) because it represents a lowstand [[Depocenter#Sediment_supply_rate_and_facies_patterns|prograding]] complex at the same position as preceding shelf-edge depositional breaks. As such, this lowstand is part of a type 2 depositional sequence and would be called a shelf-margin systems tract. If the criteria of Van Wagoner et al.<ref name=ch04r70 />) are used, the High Island–East Breaks shelf-margin delta would be called a type 1 lowstand prograding complex because the preceding shoreline break is tens of miles further north on the Texas shelf. Clarification of such scale-dependent reference points is critical to effective communication through the careful selection of precise labels for elements of depositional sequences.

==See also==

==See also==