Changes

The high abundance of ''G. menardii'' at depths of 0-20 ft (0-7 m) shown in [[:file:sedimentary-basin-analysis_fig4-20.png|Figure 2]] correlates with the interval at the sea floor that is part of the regionally extensive transgressive mud of the Holocene. The arrow on the seismic section, shown on Figure 4-19, at about 0.6 sec (two-way time) marks a trough between two high-amplitude continuous reflections that also correlate with the high-abundance interval of ''G. menardii'' between 190 and [[length::320 ft]] (58 and 98 m). In contrast, the stratigraphic intervals of ''G. menardii'' low abundance and ''G. inflata'' high abundance correlate with the shingled-clinoform seismic facies.

The high abundance of ''G. menardii'' at depths of 0-20 ft (0-7 m) shown in [[:file:sedimentary-basin-analysis_fig4-20.png|Figure 2]] correlates with the interval at the sea floor that is part of the regionally extensive transgressive mud of the Holocene. The arrow on the seismic section, shown on Figure 4-19, at about 0.6 sec (two-way time) marks a trough between two high-amplitude continuous reflections that also correlate with the high-abundance interval of ''G. menardii'' between 190 and [[length::320 ft]] (58 and 98 m). In contrast, the stratigraphic intervals of ''G. menardii'' low abundance and ''G. inflata'' high abundance correlate with the shingled-clinoform seismic facies.

Stratigraphic intervals with abundant ''G. menardii'' are interpreted to indicate warmwater interglacial conditions, and abundant ''G. inflata'' are interpreted as temperate-water glacial indicators.<ref name=ch04r52>Kennett, J., P., Elmstrom, K., Penrose, N., 1985, The last deglaciation in Orca basin, Gulf of Mexico: high-resolution planktonic foraminiferal changes: Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 50, p. 189–216.</ref><ref name=ch04r63>Martin, R., E., Neff, E., D., Johnson, G., W., Krantz, D., E., 1990, Biostratigraphic expression of sequence boundaries in the Pleistocene: the Ericson and Wollin zonation revisited: Proceedings, Gulf Coast Section SEPM 11th Annual Research conference, p. 229–236.</ref> The correlation of abundant ''G. menardii'' with the regionally extensive transgressive mud of the Holocene provides local confirmation of the warm-water interglacial interpretation. The regionally continuous reflections at 0.6 sec also indicate a transgressive interglacial interval. The shingledclinoform facies correlates with the ''G. inflata'' abundance peak, suggesting deposition during temperate-water glacial conditions.

Stratigraphic intervals with abundant ''G. menardii'' are interpreted to indicate warmwater interglacial conditions, and abundant ''G. inflata'' are interpreted as temperate-water glacial indicators.<ref name=ch04r52>Kennett, J. P., K. Elmstrom, and N. Penrose, 1985, The last deglaciation in Orca basin, Gulf of Mexico: high-resolution planktonic foraminiferal changes: Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 50, p. 189–216.</ref><ref name=ch04r63>Martin, R. E., E. D. Neff, G. W. Johnson, and D. E. Krantz, 1990, Biostratigraphic expression of sequence boundaries in the Pleistocene: the Ericson and Wollin zonation revisited: Proceedings, Gulf Coast Section SEPM 11th Annual Research conference, p. 229–236.</ref> The correlation of abundant ''G. menardii'' with the regionally extensive transgressive mud of the Holocene provides local confirmation of the warm-water interglacial interpretation. The regionally continuous reflections at 0.6 sec also indicate a transgressive interglacial interval. The shingledclinoform facies correlates with the ''G. inflata'' abundance peak, suggesting deposition during temperate-water glacial conditions.

Note that the intervals of abundant ''G. menardii'' are thicker than intervals with abundant ''G. inflata''. This suggests that more sediment accumulates associated with glacial low-stand [[Depocenter#Sediment_supply_rate_and_facies_patterns|progradation]]. Deposition of the thick clinoform packages necessitates some fault movement to accommodate the sediment accumulation.<ref name=ch04r8>Armentrout, J., M., 1993, Relative seal-level variations and fault-salt response: offshore Texas examples: Proceedings, Gulf Coast Section SEPM 14th Annual Research Conference, p. 1–7.</ref>

Note that the intervals of abundant ''G. menardii'' are thicker than intervals with abundant ''G. inflata''. This suggests that more sediment accumulates associated with glacial low-stand [[Depocenter#Sediment_supply_rate_and_facies_patterns|progradation]]. Deposition of the thick clinoform packages necessitates some fault movement to accommodate the sediment accumulation.<ref name=ch04r8>Armentrout, J. M., 1993, Relative seal-level variations and fault-salt response: offshore Texas examples: Proceedings, Gulf Coast Section SEPM 14th Annual Research Conference, p. 1–7.</ref>

==See also==

==See also==