Because of the gold and other minerals found here, this is the most intensively studied geological area in the world although this was only conclusively identified as an impact crater in the 1990s.
Sadly, it is lantana, a huge pest in our country too. I can't get it out because it is growing in the rock so, much as I hate putting herbicide into the environment I am going to have to bite the bullet and cut it right back and put herbicide on the stems