1. A rock body that is lens-shaped and enclosed in a stratum of different material. 2. A rock stratigraphic unit that is a subdivision of a formation and has limited geographic extent; it thins out in all directions.
Related terms:
1. A rock body that is lens-shaped and enclosed in a stratum of different material. 2. A rock stratigraphic unit that is a subdivision of a formation and has limited geographic extent; it thins out in all directions.
Related terms: