Changes

==Microfossil abundance patterns==

==Microfossil abundance patterns==

Microfossil abundance patterns are relative high and low peaks in the number of microfossils found in a sample or set of samples. They most often indicate sedimentation rates.<ref name=ch04r10>Armentrout, J., M., Clement, J., F., 1990, Biostratigraphic calibration of depositional cycles: a case study in High Island–Galveston–East Breaks areas, offshore Texas: Proceedings, Gulf Coast Section SEPM 11th Annual Research Conference, p. 21–51.</ref> Intervals with slow rates of sediment accumulation have consequent concentrations of abundant fossils and are associated with maximum flooding and transgressive surfaces. Intervals with high rates of sedimentation usually have low fossil abundances due to dilution and are often associated with sequence boundaries.

Microfossil abundance patterns are relative high and low peaks in the number of microfossils found in a sample or set of samples. They most often indicate sedimentation rates.<ref name=ch04r10>Armentrout, J. M., and J. F Clement, 1990, Biostratigraphic calibration of depositional cycles: a case study in High Island–Galveston–East Breaks areas, offshore Texas: Proceedings, Gulf Coast Section SEPM 11th Annual Research Conference, p. 21–51.</ref> Intervals with slow rates of sediment accumulation have consequent concentrations of abundant fossils and are associated with maximum flooding and transgressive surfaces. Intervals with high rates of sedimentation usually have low fossil abundances due to dilution and are often associated with sequence boundaries.

==Illustration of sequence boundaries==

==Illustration of sequence boundaries==