Apparently on date Wed, 30 Jun 2004 04:08:35 -0400, Gary Coffman
said:

shown to have the characteristic porosity caused by
atmospheric melting, and that one may have been the result
of an accidental exposure at some point to temperatures in
excess of 1877F (a forest fire is a scenario I suggested to
produce that high temperature).

We did come up with the idea that you might get this sort of temperature in a
funeral pyre, because you need that sort of temperature to turn the body to
ash.