A sequence of 14 reversals (that is, seven periods of reversed polarity) is observed in Maestrichtian sedimentary rocks from the Mendez Shale of Mexico and in cores from Deep Sea Drilling Project Sites 207A and 208, Lord Howe Rise. Data from a paleomagnetic investigation indicate that (1) a brief interval of frequent field reversals occurred at the close of Late Cretaceous time (Maestrichtian), (2) a short interval of reversed polarity occurred in latest Maestrichtian and earliest Danian time, and (3) the top of the so-called “Cretaceous quiet interval” occurs close to the Campanian-Maestrichtian boundary.

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