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The marine unconformities occurring in the northwestern Gulf Coast region are classified into: (1) non-deposition unconformities (parallel unconformities); (2) truncation unconformities (angular unconformities); and (3) excavation unconformities (scour-and-fill unconformities).
This classification is applied to the unconformities already reported in Gulf Coast literature; additional examples of unconformities are described and illustrated from western Madison and central Orange Counties, Texas.
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