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Unscrambling Time in the Fossil Record

Geochronologist Glenn Goodfriend and paleontologist Stephen Jay Gould report on page 1894 how they used a combination of two dating techniques to extract a 15,000-year-long record of one campaign in a land snail's long and ultimately successful battle to win the Bahamian island of Great Inagua from a native species. This fossil record revealed a surprisingly prolonged intermingling of an invading species and its eventual victim.