Fossil worm burrows, Museum of the Earth, Ithaca NY, USA. Source: https://www.sciencephoto.com/media/622881/view/fossil-worm-burrows-arthrophycus-
zo trace fossil worm burrows
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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)