DetailsFosilised worm burrows or tubes which have since become infilled with phosphate. They are sometimes known as serpoud tubes, and appear just as you might think, numerous wiggling lines with no orientation to them. The specimen measures 9 x 6 cm and was collected from Abingdon, Oxfordshire in the UK. It is dated to the Kimmeridgian epoch, which was in the Jurassic period, dating the fossil to between 157 to 152 million years old. Supplied in a card tray with an information label.