单词	index fossil
释义	index fossil noun : a fossil usually with a narrow time range and wide spatial distribution that is used in the identification of related geologic formations Example Sentences Recent Examples on the Web Pappas reports that Agnostus is a great index fossil. Jason Daley, Smithsonian, 19 Sep. 2017 Word History First Known Use 1900, in the meaning defined above
随便看	berley berleyed berleying berleys Berlichingen Berlin berlin black berlin blue berlin brown Berlin porcelain berlin red Berlin Wall Berlin ware Berlin wool Berlin work Berliner berliner berliners berlines berlinite berlins Berlioz berliozian berloque Berlusconi

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