which feature causes a gap in the geologic record?\n\nextrusion\nfault\nintrusion\nerosion

Brief Explanations:

In geology, a gap in the geologic record is known as an unconformity. This occurs when rock layers are removed or when sediment deposition stops for a long period. Erosion is the primary process that removes existing rock layers, thereby creating a chronological gap where the history of that time period is missing from the local rock sequence. In contrast, features like faults, intrusions, and extrusions represent events that occur within or on top of the existing record rather than removing parts of it.

Answer:

erosion