1A surface of contact between two groups of unconformable strata.
- ‘First, there are no late Cambrian rocks in many areas: they are represented by unconformities.’
- ‘The middle Osagean age of the fauna indicates a previously unrecognized unconformity between the Nada and the overlying Meramecianage Renfro Member of the Slade Formation.’
- ‘That unconformity is overlain by sandstones of the Puentelles Formation, dated as late Kasimovian based on its fossil flora.’
- ‘Both overlie a pronounced angular unconformity and both are predominantly fluvial deposits.’
- ‘Data on a systemic boundary unconformity on the west Newfoundland shelf are more problematic.’
- 1.1The condition of being unconformable.
- ‘You still get men wearing hats now but it's almost a sign of unconformity for a young man to wear a hat apart from baseball hats.’