DescriptionForaminiferal Colouration Index (FCI) - Example from an Oil Well.png
English: Agglutinated foraminifera (microfossils) become progressively darker with increasing burial depth and temperature. Specimens are from an oil well. Burial depths range from 2000 to 4000 metres. Calculated temperatures in the borehole ranged from 60oC to 110oC. Colour changes are quantified using the Foraminifera Colouration Index (FCI). FCI values ranged from 2 to 6.
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