Science: Fossil Climate

Ichthyologist Carl Hubbs, of the Scripps Institution of Oceanography, has been writing the history of California's climate as far back as 2000 B.C. Five years ago, studying water temperatures off Lower California, he camped at Santo Tomas, and with a true scientist's curiosity about things that did not directly concern him, he dug into an ancient Indian camp site and turned up the shell of a cryptochiton, a large, limpet-like mollusk.

Only a marine biologist would have found the shell exciting. Hubbs knew that cryptochitons do not live, at present, south of Santa Barbara,...

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