Record low water in the Rio Negro of Brazil has revealed petroglyphs that were previously under water. The story was originally reported by Reuters (go here to see the story and images) but has appeared in multiple news outlets. One of the best is in the Guardian (here). The images are not well studied but thought to be of similar age to other petroglyphs in the Amazon -1,000 to 2,000 years old.
The images were previously revealed by a 2010 droubt that dropped water levels in the Rio Negro to similar levels.
In this case drought reveals petroglyghs that were hiden. but extreme weather threatens rock art around the world. Climate change and the extreme swings of weather it brings is one of the reasons for the Ancient Art Archive’s digital preservation work.