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🪨 A rock gap 🎨 Not following rules
unconformity

unconformity

1 9.9
A surface between rock layers that shows a long gap in time
  • noun
  • /ˌʌnkənˈfɔːrmɪti/
  • Specialized
translation icon : inconformidad
  • The large unconformity observed between the Woodbine and the Austin Chalk is in actuality the one termed the Eagleford Unconformity between the Woodbine and the Eagleford.
  • unconformity gap

Examples

  • The unconformity between the Eagle Ford and the Austin Chalk does not represent much time except in the areas where the two unconformities merge due to the absence of the Eagle Ford.

    Blog text (18)

  • For weeks I've been dealing with geology's analogue of unconformity, the fascinating gap of missing material, missing information.

    Academic text (2007)

  • But invisible to me, at least, is the first of two major geologic unconformities, vast gaps in the sedimentary record.

    Academic text (2007)

  • The unconformity between the Eagle Ford and the Austin Chalk does not represent much time except in the areas where the two unconformities merge due to the absence of the Eagle Ford.

    Blog text (18)

  • The large unconformity observed between the Woodbine and the Austin Chalk is in actuality the one termed the Eagleford Unconformity between the Woodbine and the Eagleford.

    Blog text (18)

  • Aggieland Field, which is a sand reservoir, is in fact Eagleford in age and represents a part of an Eagleford-aged paleo Brazos river system that was preserved below the Austin Chalk unconformity due to a shallow structural depression related to salt movement.

    Blog text (18)

  • The unconformity represents a significant gap in the geological record, formed by erosion over millions of years.

  • Geologists study the unconformity between sedimentary layers to understand the history of the Earth's landscape.

  • At this site, the unconformity indicates a period where no new sediment was deposited, leaving a clear break in the geological timeline.

Synonyms

disconformity
vsunconformity
  • Specialized
9.9

A break in flat rock layers where some layers are missing, showing past erosion

is the general term for a surface marking gaps between layers
discordancy
vsunconformity
  • Specialized
9.9

A place where rock layers do not line up because one cuts across another

is a surface showing a gap from erosion or no deposition rather than misalignment

Surface Forms

unconformity singular
unconformities plural

Morphology

unconformity = conformity (semi-transparent) = un + conform + ity

The form is clearly un- + conformity, but the geological sense names a specific technical surface (specialized usage) rather than the abstract state, so learners may not infer the meaning directly.

Etymology

Unconformity comes from un- 'not' plus conform 'to fit together' and the ending -ity that turns it into a thing. So, in geology an unconformity is a place where rock layers do not 'fit together', showing a break or missing time in the record.