Discussion by P. C. Benedict (p. 638-639), M. G. Bardet (p. 827-830), M. J. O'Hara and E. L. P. Mercy (p. 830-832), and T. C. James (p. 1073-1080), and author's reply (p. 1735-1739). In the author's reply, eclogites, garnet peridotites, and diamonds in kimberlite are considered to be of crustal origin. The high pressure for formation of diamonds is attributed to shock in cryptovolcanic structures.

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