Archaeology: ‘Mass grave’ was buried under volcanic ash 1000 miles from eruption

“As the lungs fail, the skeletal system goes out of control, rapidly depositing new bone on top of old.

“It reveals that the animals died a slow and painful death, as their lungs, choked by ash, started to fail.

“It caused their bones to grow thicker. Racked with pain, they were drawn to the waterhole, where they died, all within a month of the eruption.”

The site is now a National Natural Landmark, having been awarded such status in 2006.

Specially constructed walkways allow tourists to watch palaeontologists at work during the summer season.

Article source: https://www.express.co.uk/news/science/1590934/archaeology-news-mass-grave-volcanic-ash-yellowstone-supervolcano-spt