The article Mike cited says:
"It has been however impossible to find typical tephra shards in sites
located at a few km around the one with the tephra deposit The restricted
occurrence of the later suggests that the massive tephra accumulation can no
longer be considered as a typical fallout derived from the dispersion of
material from a terrestrial volcanic explosion. Analytical investigations in
various directions have been unable, so far, to refute or confirm that a
cosmic event would have been the cause for production of both the widely
distributed mysterious particles and the localised thick tephra. Origin of
this mysterious phenomena still remains unsolved. "
Cosmic events don't dump tephra in a localized region. Indeed, they don't
dump tephra at all. Tephra is a volcanic ash and has little to do with
meteors or cosmic phenomenon.
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