Corrections and Clarifications

Quaternary Geology Reviewed

Science  24 Dec 1965:
Vol. 150, Issue 3704, pp. 1709
DOI: 10.1126/science.150.3704.1709


I find an error of fact in my book review, "Quaternary Geology Reviewed" (1 Oct., p. 49, paragraph 4, column 3). The review states that ". . . Pleistocene mollusks along the arctic coast of Alaska have Atlantic rather than Pacific Ocean affinities, suggesting that the bridge existed during much or all of Pleistocene time. . . ."

The mollusks referred to are late Tertiary, not Pleistocene. Pleistocene mollusks with Pacific Ocean affinities are known along the coast of Alaska north of Bering Strait. Hopkins, who has reported most fully on the geologic history of the land bridge [Science 129, 1519 (1959)], referred to these occurrences. From this and other evidence he concluded that seaways connected the Arctic and Pacific Oceans during the interglaciations, that the bridge existed during the glaciations, and that its climate then was severely arctic.

The point of the paragraph remains unchanged; a glacial maximum is hardly a favorable time for migrations practically at the Arctic Circle.