Part of page 72 of A.B. Busbey, R.C. Coenraads, D. Root and P. Willis, 2013, “Rocks and Fossils”.
5 Busbey et al p72 222
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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)