英语词汇“index fossil”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	index fossil
释义	index fossil noun : a fossil that is usually of narrow time range and wide spatial distribution and that is used in the identification of related geologic formations (as in locating new petroleum reserves)
随便看	heleoplankton helepole helepolis helgramite helgrammite heli heli- heliacal heliacal heliacal cycle heliacally heliacal year heliamphora helianthaceous helianthate helianthemum helianthin helianthine helianthus heliast heliastic heliazophyte helic helic- helical

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