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Re: Dinosaur Extinction: Impact vs Volcanoes--Shocked Quartz in Volca nics



Varricchio, Louis schrieb:

> Shocked quartz, even "coesite," have been reported in volcanic rocks.
> I will dig out the references. One I am sure of was the late Harvard
> geologist William Bucher's 1960s in-depth paper which challenges the
> idea that some crypto- explosion structures (as they were called back
> then) are impact craters. He apparently hunted for--and
> found!--examples of shatter cones, shocked quartz, even coesite,
> derived from explosive volcanoes.

There was an interesting book review in SKY & TELESCOPE, May 1980, p.
410:

Astroblemes - Cryptoexplosion Structures
G.J.H McCall, editor
Benchmark Papers in Geology, Vol. 50
Academic Press, Inc., New York, 1979
473 pages
$ 39.50 (back then in 1980, of course)

Best wishes,

Bernd

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