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The Black Mesa Basin of northeastern Arizona contains the stratigraphic record of the transgression and regression of the Greenhorn Sea during late Cenomanian to late middle Turonian time. The transgressive phase of the cycle is much thinner than the regressive phase. Foraminiferal data suggest that peak transgression of the Greenhorn Sea occurred during mid-early Turonian to earliest middle Turonian time (Mammites nodosoides to perhaps basal Collignoniceras woollgari Biozone) in this area of the interior seaway.

The Cenomanian/Turonian boundary interval is marked by dynamic changes in the population structure of planktonic foraminifera and in foraminiferal abundance. It is suggested that...

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