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Science 8 August 1969:
Vol. 165. no. 3893, pp. 583 - 585
DOI: 10.1126/science.165.3893.583
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Articles

Tertiary Climatic Change in the Marginal Northeastern Pacific Ocean

W. O. Addicott 1

1 U.S. Geological Survey, Menlo Park, California 94025

Analysis of distributional patterns of shallow-water molluscan faunas of the middle latitudes of the marginal northeastern Pacific Ocean discloses a sharp reversal during the Miocene of the progressive climatic deterioration. A low point in the Tertiary cooling trend during the Oligocene was followed by climatic warming that culminated during the middle Miocene, as illustrated by a series of zoogeographic profiles.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)