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	cottager cottagers cottages cottages ornés cottagey cottaging cottar cottars cottas Cottbus cotte cotted cotter cotter drill cotter mill cotter pin cottered cotterel cottering cotterless cotters cotterway cotti Cottian Alps cottice

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