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Subject:	Re: assorted questions on Echinoderms
From:	Emilio <[log in to unmask]>
Reply To:	Conchologists of America List <[log in to unmask]>
Date:	Sat, 5 Jul 2003 12:23:49 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (14 lines)

Not quite. Shocked quartz has been proven to be due only to impact.
[or at H-Bomb test sites].

Andrew Grebneff wrote:

>
> In all of the recent works I have read on extinction events, those
> other than the K-T have been noted as LACKING tektites, iridium
> enrichment etc.
>
> Also, shocked quartz can be produced by volcanic activity; it was
> once regarded as being impact-only.
>

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