Diastem | Article about diastem by The Free Dictionary
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A temporal break between adjacent geologic strata that represents nondeposition or local erosion but not a change in the general regimen of deposition.
References in periodicals archive
Fragments of detrital material as silty and clayey material including elongated pebbles and breccias of the surrounding basement and young basalt are incorporated in channels troughs which form small unconformity surfaces or diastems
within the tufa.