“The Deniliquin structure, yet to be further tested by drilling, spans up to 520km in diameter.”
Andrew Glikson and Tony Yeates say a 520km impact structure sits under the Murray Basin near Deniliquin. That would beat South Africa’s near-300km Vredefort, the current record holder. The evidence is magnetic ripples, radial faults and a seismic dome. Nobody has drilled it. The world’s largest crater is so far a magnetic map and a confident press release.