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Index-fossil (archaeology)

archaeologist element (not really a fossil) used to determine age

Pronunciation
/ˈɪndɛks - ˈfɒsəl ( ˌɑːkɪˈɒləʤi )/
/ˈɪnˌdɛks - ˈfɑsəl ( ˌɑrkiˈɑləʤi )/