− | Constructing depositional cycle charts for the GOM basin extends back to at least Kolb and Van Lopik<ref name=ch04r55>Kolb, C., R., Van Lopik, J., R., 1958, Geology of the Mississippi River deltaic plain, southeastern Louisiana: U., S. Army Engineer Waterway Experiment Station, Corps of Engineers, Vicksburg, MS, Technical Report 3-483, 120 p.</ref> and Frasier<ref name=ch04r33>Frasier, D., E., 1974, Depositional episodes: their relationship to the Quaternary stratigraphic framework in the north-western portion of the Gulf basin: University of Texas at Austin, Bureau of Economic Geology Circular 74-1.</ref> with Beard et al..<ref name=ch04r18>Beard, J., H., Sangree, J., B., Smith, L., A., 1982, [http://archives.datapages.com/data/bulletns/1982-83/data/pg/0066/0002/0150/0158.htm Quaternary chronology, paleoclimate, depositional sequences, and eustatic cycles]: AAPG Bulletin, vol. 66, p. 158–169.</ref> demonstrating the link between depositional sequences and glacial eustasy. The following figure is a composite chronostratigraphic chart that serves as an age model for the GOM basin Pliocene and Pleistocene, summarizing nine studies published between 1982 and 1993. The local cycle charts from each of these studies have been calibrated to the same time scale using the same bioevent marker taxa and are in turn correlated to the global foraminiferal zones and magnetostratigraphic polarity scale as defined by Berggren et al.<ref name=ch04r19>Berggren, W., A., Kent, D., V., Van Couvering, J., A., 1985, The Neogene: part 2. Neogene geochronology and chronostratigraphy in Snelling, N., J., ed., The Chronology of the Geologic Record: Blackwell Scientific Publishing and Geological Society of London Memoir 10, p. 211–260.</ref> and the oxygen isotope chronology of Joyce et al.<ref name=ch04r51>Joyce, J., E., Tjalsma, L., R., C., Prutzman, J., M., 1990, High-resolution planktic stable isotope record and spectral analysis for the last 5., 35 myr: ODP site 625 northeast Gulf of Mexico: Paleoceanography, vol. 5, p. 507–529.</ref> The resulting sum of the depositional sequences and their associated condensed sections (Schaffer, 1987a, b, .<ref name=ch04r72>Pacht, J., A., Bowen, B., E., Bearn, J., H., Schaffer, B., L., 1990, Sequence stratigraphy of Plio–Pleistocene depositional facies in the offshore Louisiana south additions: Gulf Coast Assoc. of Geological Societies Transactions, vol. 40, p. 1–18.</ref> are illustrated. | + | Constructing depositional cycle charts for the GOM basin extends back to at least Kolb and Van Lopik<ref name=ch04r55>Kolb, C., R., Van Lopik, J., R., 1958, Geology of the Mississippi River deltaic plain, southeastern Louisiana: U., S. Army Engineer Waterway Experiment Station, Corps of Engineers, Vicksburg, MS, Technical Report 3-483, 120 p.</ref> and Frasier<ref name=ch04r33>Frasier, D., E., 1974, Depositional episodes: their relationship to the Quaternary stratigraphic framework in the north-western portion of the Gulf basin: University of Texas at Austin, Bureau of Economic Geology Circular 74-1.</ref> with Beard et al..<ref name=ch04r18>Beard, J., H., Sangree, J., B., Smith, L., A., 1982, [http://archives.datapages.com/data/bulletns/1982-83/data/pg/0066/0002/0150/0158.htm Quaternary chronology, paleoclimate, depositional sequences, and eustatic cycles]: AAPG Bulletin, vol. 66, p. 158–169.</ref> demonstrating the link between depositional sequences and glacial eustasy. The following figure is a composite chronostratigraphic chart that serves as an age model for the GOM basin Pliocene and Pleistocene, summarizing nine studies published between 1982 and 1993. The local cycle charts from each of these studies have been calibrated to the same time scale using the same bioevent marker taxa and are in turn correlated to the global foraminiferal zones and magnetostratigraphic polarity scale as defined by Berggren et al.<ref name=ch04r19>Berggren, W., A., Kent, D., V., Van Couvering, J., A., 1985, The Neogene: part 2. Neogene geochronology and chronostratigraphy in Snelling, N., J., ed., The Chronology of the Geologic Record: Blackwell Scientific Publishing and Geological Society of London Memoir 10, p. 211–260.</ref> and the oxygen isotope chronology of Joyce et al.<ref name=ch04r51>Joyce, J., E., Tjalsma, L., R., C., Prutzman, J., M., 1990, High-resolution planktic stable isotope record and spectral analysis for the last 5., 35 myr: ODP site 625 northeast Gulf of Mexico: Paleoceanography, vol. 5, p. 507–529.</ref> The resulting sum of the depositional sequences and their associated condensed sections (<ref>Shaffer, B. L., 1987a, The potential of calcareous nannofossils for recognizing Plio–Pleistocene climatic cycles and sequence boundaries on the shelf: Proceedings, Gulf Coast Section SEPM 8th Annual Research Conference, p. 142–145.</ref><ref>Shaffer, B. L., 1987b, The nature and significance of condensed sections in Gulf Coast late Neogene sequence stratigraphy: Gulf Coast Assoc. of Geological Societies and Gulf Coast Section SEPM Transactions, vol. 40, p. 767–776.</ref><ref name=ch04r72>Pacht, J., A., Bowen, B., E., Bearn, J., H., Schaffer, B., L., 1990, Sequence stratigraphy of Plio–Pleistocene depositional facies in the offshore Louisiana south additions: Gulf Coast Assoc. of Geological Societies Transactions, vol. 40, p. 1–18.</ref> are illustrated. |