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Specimen preparer Carl Bennett uses a compressed air tool to remove foreign materials from the fossilized skull of a giant sloth, in Riverside, Calif., Monday, Sept. 20, 2010.  Utility workers preparing to build a new substation in an arid canyon southeast of Los Angeles stumbled on a trove of animal fossils dating back 1.4 million years that researchers say will fill in blanks in Southern California's history. (AP Photo/Reed Saxon)
Photo by: Reed Saxon
Specimen preparer Carl Bennett uses a compressed air tool to remove foreign materials from the fossilized skull of a giant sloth, in Riverside, Calif., Monday, Sept. 20, 2010. Utility workers preparing to build a new substation in an arid canyon southeast of Los Angeles stumbled on a trove of animal fossils dating back 1.4 million years that researchers say will fill in blanks in Southern California's history. (AP Photo/Reed Saxon)

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