ANSWER:
If 'several flat-lying sedimentary layers' and studied in depth. Later after the study we determine that there is a 'considerable span of time' for which 'no sedimentary rock layer' exists at this site then dis-conformity is discovered.
Step-by-step explanation:
- Dis-conformity is defined as an occurrence where there is a crack in the sedimentary sequence which will not affect the variation of inclination among the strata.
- Dis-conformity is believed to exist whenever any sort of portion of part gets missing.