Of natural form, from the Oligocene (circa 30 million years ago), the top layers of concretions suggestive of the head of praying mantis, with soft edges and a rounded lower half, supported on stand.

18¹⁄₂ x 8 x 6¹⁄₂in. (47 x 20 x 17cm.)

Anonymous Sale; Christie's, London, 16 May 2022, lot 33.

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