Protovirgularia trace fossils from Japan. Source: Page 3 of https://www.academia.edu/849702/_Deep-sea_bivalvian_highways_An_ethological_interpretation_of_branched_Protovirgularia_of_the_Palaeogene_Muroto-Hanto_Group_southwestern_Japan
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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)