Plate 20 and page 49 of Jocelyn Thornton’s (1985) “Gemstones”. 1 = Fossil fern stems, as can be found at Slope Point.
thornton oth plnt
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A Blog About Stone Gathering, Tumbling and Polishing, and Rocks and Landscapes, from New Zealand – With Musical Interludes (john.tumblestone@gmail.com)