volcanic ash

noun Geology.
ash ( def 2 ).


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Thanks to fine volcanic ash, however, this spider was squashed without breaking
  up its delicate exoskeleton.
The pristine fossil pictured in these photos was probably created when the
  spider was trapped in volcanic ash.
Volcanic ash is formed during explosive volcanic eruptions.
And the layers of volcanic ash built up over millennia dampen any shaking.
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