2019
HY2115 : Rock, Brough of Bigging, Orkney
taken 5 years ago, near to Yesnaby, Mainland, Orkney Islands, Scotland
Rock, Brough of Bigging, Orkney
With thanks to the British Geological Survey and contributors to the Geograph discussion at
Link :
"These structures are trace fossils of the genus Thalassinoides. Specifically they are branching horizontal burrows made by shrimps, crabs, worms, fish, echinoids etc. burrowing through soft sediment on the seafloor. The burrows remain but the creatures which made them typically do not! They could be locomotion (travel) burrows, or the organisms were sieving out food from the sediment, or both."
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