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The pyrite framboid size distribution of 26 samples from the Grey Shales were analysed to determine
the water column redox history of the sediments. The pyrite framboids range from 4.46µm to 8.76µm in
diameter which is indicative of framboids nucleation and growth within an oxic to dysoxic water column. In
contrast to the higher oxygenation shown by the framboid size distribution pattern, the paleoecologies of the
sediments indicate severe depletion of oxygenated conditions. This variance may have been due to a fluctuating
redox interface leading to brief periods of oxygenation or size sorting from storm events that probably favoured
the preservation of larger size framboids.