10,323
edits
Changes
Jump to navigation
Jump to search
Line 32:
Line 32: − The high abundance of ''G. menardii'' at depths of 0-20 ft (0-7 m) shown in Figure 4-20 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. − + + +
Identifying depositional sequences from biostratigraphic data (view source)
Revision as of 14:05, 11 February 2014
, 14:05, 11 February 2014→Pattern interpretation
==Pattern interpretation==
==Pattern interpretation==
[[file:sedimentary-basin-analysis_fig4-20.png|thumb|{{figure number|4-20}}. Copyright: Armentrout (1993<ref name=ch04r9 />); courtesy Gulf Coast SEPM and Geological Society of London.]]
[[file:sedimentary-basin-analysis_fig4-20.png|thumb|{{figure number|1}}. Copyright: Armentrout (1993<ref name=ch04r9 />); courtesy Gulf Coast SEPM and Geological Society of London.]]
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 1]] 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., 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.