Serpula socialis
Palm sized piece of Oolitic Limestone. The top surface is covered in 'stings; of intertwining marine worm colonies. 3D, well preserved and showing nice detail under magnification.
Jurassic, Bajocian, Inferior Oolite.
Fiddler's Elbow quarry near Brockworth, Gloucestershire.
Specimen : 11 x 6 x 3 cm.