Fossil worm cast stone. The trace rising from the bottom left is chevron-shaped, known as ichnogenus Protovirgularia, a general term for the trace fossil shape irrespective of its size and what may have produced it.
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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)