Phoebichnus trochoides Bromley et Asgaard, 1972

Description: Central shaft with an unknown depth and 5-8 cm in diameter with numerous long, straight burrows, up to 40 cm long, generally radiating horizontally from it, however, occasionally they are radiating obliquely upward to the sediment surface with an inclination less than 45°; radial burrows have a diameter up to 1.5 cm including a lumen c. 1 cm wide containing active fill with meniscus convex towards the shaft, and a mantle 5 mm thick composed of discrete annuli concave towards the shaft; an annulation is imparted by the wall to the surface of the fill and the surrounding sediment; often present in large numbers in distinct horizons.