Natures Wonders; bivalve strength (Introduction)
by David Turell 
, Monday, November 14, 2011, 16:19 (4758 days ago) @ David Turell
Shell fish have mother-of-pearl layers of defense. the mechanism is now explained:
http://www.physorg.com/news/2011-11-nature-armor-stronger-materials.html
Of course there is the Darwin story also: 'They learned gradually how to do it'. No fossils are mentioned to prove that contention.
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