Tsunamiite is a sedimentary deposit formed by a tsunami, typically characterized by a distinct layer of mixed sediments that may include marine fossils, rip-up clasts, and coarse debris. Tsunamiites are significant in sedimentology for understanding past tsunami events, their sedimentary signatures, and the impacts on coastal environments.
Source Goto, K., Chague-Goff, C., & Jaffe, B. E. (2012). “The Future of Tsunami Research Following the 2011 Tohoku-Oki Event.” Sedimentary Geology, 282, 1-13.