{"refrec":{"BRefID":123501,"RR":"<b>Goto, K.</b> (2008). The genesis of oceanic impact craters and impact-generated tsunami deposits, <b><i>in</i></b>: Shiki, T. <i>et al.</i> (Ed.) <i>Tsunamiites: features and implications.</i> pp. 277-297","BEntID":117716,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: Shiki, T. <i>et al.</i> <i>Tsunamiites: features and implications.</i> pp. 277-297","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Goto, K.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Goto, K.","Englishabstract":"The properties of oceanic impact craters, the generation of impact tsunamis and the genesis of impact-generated tsunami deposits are reviewed based on studies of wellknown oceanic impacts. In the case of an oceanic impact, ocean water flows into the crater immediately after the impact. As a consequence, oceanic impact craters usually show little or no evidence at all of a high crater rim. The deposits formed by the inflowing water are concentrated in gullies eroded by the moving water mass as well as inside the crater. Impact-generated tsunami waves affect the surrounding ocean bottom and coastal areas, and tsunami deposits are formed around the crater. The Cretaceous/Tertiary (K/T)-boundary tsunami deposits are the best-studied impact-generated tsunami deposits. Their thickness decreases with distance from the Chicxulub crater. The K/T-boundary tsunami deposits have the following common properties: (1) similar thickness, grain-size and composition over a wide area; (2) opposite current directions in successive units or repeated compositional cycles that probably reflect recurrent tsunami currents; (3) the presence of terrestrial material such as plant and wood fragments and (4) the absence of a typical Bouma sequence. 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