English

Thoughts on a pebble : or a first lesson in geology

Sixth edition "'I shall confine my remarks to a flint pebble, [...],' states Mantell, and then goes on to show how such siliceous concretions originate within the chalk and what they look like when opened through 'the assistance of the lapidary,' the two hand-colored plates showing a whole pebble with fossiliferous imprints and the second plate the internal patterns after cutting and polishing."--Gemology by J. Sinkankas, entry no. 4165.

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