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Several diatom datum levels are proposed for latest Miocene/earliest Pliocene sediments in the equatorial and north Pacific. These datum levels are tied directly to the magnetostratigraphy and may be summarized as follows:

1) Last occurrence of Denticulopsis hustedtii—middle of Chron 10 in the equatorial Pacific.

2) First occurrence of Thalassiosira burckliana—lower part of Chron 9 in the equatorial Pacific.

3) First occurrence of Coscinodiscus nodulifer var. cyclopus—middle of Chron B in the equatorial Pacific.

4) Last occurrence of Thalassiosira burckliana—lowest part of Chron 7 in the equatorial Pacific.

5) First occurrence of Rossiella praepaleacea—lower part...

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