You searched for: “diachronous
1. In geology, a rock unit, varying in age in different areas or cutting across time planes or biostratigraphic zones; time-transgressive.
2. Describing a lithological unit whose age varies from place to place, or a lithological unit (rock formation) which cuts across various times or biostratigraphic zones.
3. A geological deposit in which a sedimentary rock formation apparently consists of similar material, but varies in age from place to place.

For example, as a shoreline advances or retreats, a succession of continuous deposits representing different environments; such as, beach, shallow water, and deeper water, may be left behind as their ages vary depending on the positions of the shorelines through the various time sequences.

This entry is located in the following units: chrono-, chron- (page 6) dia-, di- (page 2) grad-, -grade, -gred, -gree, -gress (page 2)