The time needed for the formation of a 7-foot thick vertical section of the Pleistocene Key Largo coral reef of the Florida Keys is estimated, on the basis of the growth rate of the important reef-building coral species Montastrea annularis, to be between 250 and 500 years. This considerable speed is one of the most significant results of the study. It is emphasized that the above figures should not be applied to other reefs until all other factors have been taken into consideration.

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