article_snippet: The precise age of the crater is not yet known exactly, but researchers think The precise age of the crater may be around 300 million years.
article_snippet: Even though we do not know the exact age of the meteor yet, we do know life was very primitive at that time.' a 400km impact zone extends through the Earth's crust which is around 30km thick in Central Australia.
article_snippet: a 400km impact zone was flagged after rock affected by heat and pressure was turned into glass .
article_snippet: a 400km impact zone was flagged after rock affected by heat and pressure, consequently being turned into glass was discovered, also known as shock metamorphism.
article_snippet: The features of shock metamorphism show that material was dramatically thrown out of the area in a span of more than 200km, indicating the possibility of a mass extinction.
article_snippet: After using geothermal research to look at the internal heat of the Earth and seismic data to see the vibrations of the Earth's surface, the team of geophysicists released high velocity shocks two kilometres underground by drilling.
article_snippet: A plume of ash was sent up into the air from the impact and sediment from this collision is found in rocks around the world today.
article_snippet: However, none of this sediment has been discovered in 300 million-year-old samples indicating that this site could be older.
article_snippet: Further studies of the geochemistry and composition of the impact site are in progress.
highlights_snippet: a 400km impact zone was found with high velocity shocks and drilling into the earth .
  
highlights_snippet: the impact may have happened around 300 million years ago .