How Seilacher thought Protovirgularia (on right) was produced. Diagram from his book “Trace Fossil Analysis” by Adolf Seilacher (2007), p. 65. However,, note that “Imbrichus” is also similar to the trace fossil on my stone.
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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)