Hi Chris. I did the search as you suggested and this is what I came up with. Sort of fits your area. Take Care…Don in creepy town

The telltale fullerenes were extracted from sites in Japan, China and Hungary, where the sedimentary layer at the boundary between the Permian and Triassic periods had been exposed.

Dr Becker said the fullerenes were found at very low concentrations above and below the boundary layer, but they were found in unusually high concentrations at the time of the extinction

• Luann Becker