Oolite is a sedimentary rock formed from ooids, which are small, spherical grains composed of concentric layers of calcium carbonate or other minerals. Oolites are typically found in warm, shallow marine environments and are significant in the study of carbonate sedimentation and paleoenvironmental reconstruction.
Source Tucker, M. E., & Wright, V. P. (1990). “Carbonate Sedimentology.” Blackwell Science.