Evidence of this structure has been found by scientists Andrew Glikson and Tony Yeates, and their research published in the journals Tectonophysics and Gondwana Research.
It is being referred to as the Deniliquin Structure.
Mr Yeates will be in Deniliquin next week to provide more information on this ancient meteorite impact.
The presentation - titled ‘The Hidden Gaint: Deniliquin Structure Talk’ - is hosted by Deniliquin U3A with support from Edward River Council.
It will be held at the Deniliquin Town Hall from 6pm on Tuesday.
The centre of the Deniliquin Structure is thought to be about 32km northwest of Deniliquin - giving the find its name.
It is a multi-ring impact structure (DMS) approximately 520km in diameter.
Mr Glikson, an earth and paleo-climate scientist, believes the asteroid that caused the Deniliquin structure may have triggered the Hirnantian glaciation stage, also defined as the Ordovician-Silurian extinction event, which lasted between 445.2 and 443.8 million years ago.
This was one of the five great extinction events that have occurred on Earth, and was the second largest.
“Currently the bulk of the evidence for the Deniliquin impact structure is based on geophysical data obtained from the surface,” Mr Glikson said in one of his reports.
“For proof of impact, we’ll need to collect physical evidence of shock, which can only come from drilling deep into the structure.”
While attendance of the talk in Deniliquin is free, people are asked to register to attend by going to www.eventbrite.com.au and searching the event name.
12°C