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unconformable Line breaks: un|con¦form|able
Pronunciation: /ʌnkənˈfɔːməb(ə)l/

Definition of unconformable in English:


(Of rock strata in contact) marking a discontinuity in the geological record, and typically not having the same direction of stratification.
Example sentences
  • In this transect, the contact between the Carboniferous strata and the volcanic sequence appears to be an unconformable sedimentary contact.
  • Along much of its exposed length, the unconformable contact was intensely sheared during subsequent ductile deformation.
  • At this locality, the upper layers of the Mishan Formation are truncated below the unconformable contact at the base of the overlying Agha Jari Formation.


Pronunciation: /ˌʌnkənˈfɔːməbli/
Example sentences
  • These mid-Palaeozoic formations are unconformably overlain by the Carboniferous-Permian Pillahuinco Group.
  • The most significant of the south-vergent thrusts is the Besal Thrust, which places basement rocks, unconformably overlain by rocks of the First Cover Sequence, on top of rocks of the Second Cover Sequence.
  • These are unconformably overlain by Lower Carboniferous limestones of the Alapaevsk unit and cut by a Permian granite.
Definition of unconformable in:
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