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(geology) the passage of a geological formation across time planes, as occurs when a marine sediment laid down by an advancing sea is noticeably younger in the direction of advancement
Derived Forms
diachronous, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Historical Examples
  • Nor would their diachronism be more certainly inferrible from the physical traces of them, in the one case than in the other.

    Omphalos Philip Henry Gosse

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