“…Kött et al, 1995 report a rhyolitic maar), including kimberlite, various ultramafic melts (Hopi Buttes volcanic field -Williams, 1936;Missouri River Breaks -Hearn, 1968), carbonatite (Gross Brukkaros volcanic field: Kurszlaukis and Lorenz, 1997;Lorenz and Kurszlaukis, 1997), through alkali basalts (Lorenz, 1970;1973;Leys, 1983;Nemeth et al, 2001;2003), to at least tholeiitic basaltic andesite (Coombs Hills: Ross et al, 2008a). These magmas have a wide range of viscosities and inferred volatile contents, but there are few systematic differences in diatreme deposits or structures beyond those of the juvenile particles themselves (e.g., juvenile fragment shape, vesicularity, crystallinity).…”