Said of a rock unit that is of varying age in different areas or that cuts
across time planes or biozones; e.g., said of a sedimentary formation
related to a narrow depositional environment, such as a marine sand that
was formed during an advance or recession of a shoreline and becomes
younger in the direction in which the sea was moving.
Syn: time-transgressive
Source:
Dictionary of Mining, Mineral, and Related Terms
