Forty-nine species and subspecies of planktonic foraminifera are recorded in the uppermost member of the Thanet formation (the Reculver silts) and in the overlying Reading oyster bed. These include reworked specimens of late Senonian and of early and middle Paleocene ages, together with forms believed to be indigenous. The indigenous species correlate both the Reculver silts and the overlying oyster bed with the dawn of the late Paleocene, and suggest that the underlying members of the Thanet formation are slightly older. The stratigraphical position of the Thanet sands is discussed, and it is suggested that the use of the Thanetian as a stage name in Paleocene stratigraphy be avoided.

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