"Marilyn Fogel, endowed geoecology professor at UC Riverside, died on May 11 at her home in Mariposa, Calif. She was 69.

She pioneered the use of different forms of the same chemical element, called isotopes, to understand the life history of organisms, both modern and ancient. In so doing, she helped develop biogeochemistry as a new field of science with many seminal papers in the field and earned herself the moniker ‘isotope queen.’"

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