Figure 9. Associated trace fossils and bioturbate textures. 1 - 3 ) Different populations of uniformly sized, spherical features most commonly show smooth exteriors ( 1 - 2 ), but locally display rough, ornamented surfaces consisting of small, 3-4 mm humps ( 3 ). Note that A and B are both landscape images. 4 ) Rare, humped horizontal cylinder (diameter: 20 mm) at the hammer head. The spheres occur both in isolation (see white arrow in 4 ) and en mass ( 1, 2, 3, 5 ), and where their densities are high ( 5 ), they may form column-like structures (see white circle indicating the eroded base of a possible column). 6 ) Outcrop distribution of spheres in vertical section. Note the sharp upper boundary above which the host Clarens Formation is massive (Sm – massive sandstone).