Holes in rock layers that develop when erosive agents remove existing rock layers
The answer to your question is nonconformities.
Explanation of dislocations; Gaps in rock layers that develop when erosive agents remove existing rock layers are called dislocations. Each unconformity represents a missing rock layer or a gap in the rock layers. It is a contact between sedimentary rocks of different ages or between sedimentary rocks and older, eroded igneous or metamorphic rocks. Unconformities represent gaps in the geological record, periods of time that are not represented by any rock. Disagreements can take three different forms, namely disagreements, angular disagreements, and nonconformities.
Unconformity Explanation: An unconformity is a gap in a rock record that has been caused by weathering or erosion. The name refers to how they do not meet usual geological expectations. An exemplary sequence of rocks would have all strata stacked. If they don’t, the gap between incompatible strata is a nonconformance. The different types of mismatch are angular conform, mismatch, and non-conform.
Gaps in rock layers that develop when erosive agents remove existing rock layers are called unconformities.