noun, plural un·con·form·i·ties.
- a discontinuity in rock sequence indicating interruption of sedimentation, commonly accompanied by erosion of rocks below the break.
- the interface between such strata.
Examples from the Web for unconformity
If beds of rock may be regarded as leaves in the volume of geologic history, an unconformity marks a gap in the record.
Such an erosion surface, called an “unconformity,” marks a gap in the geological record of the district where it occurs.
An unconformity thus records movements of the crust and a consequent break in the deposition of the strata.The Elements of Geology|William Harmon Norton
An unconformity may indicate that the beds below it have at some time been raised above the sea and have been eroded.
And if the unconformity be widespread, the lost interval is correspondingly great.