FIGURE 5. Idealized 3D conceptual model showing the antler-like morphology of Phycosiphon structure cut to show the expected vertical cross sections. Each of the boxes 5.1-5.5 show the 3D form of Phycosiphon in different orientations along with the location of labelled cut sections, which are alphabetically linked to the vertical cross sections, which are analogous to the common sections seen in petroleum cores. 5.1-5.3. Burrow loop parallel to bedding plane and intersected with perpendicular planes to show cross sectional views. 5.4. Burrow inclined 17° from the vertical and cut by vertical planes to show cross-sectional views. 5.5. Burrow vertical to bedding plane, with bent lobes, cut in the vertical plane to show cross-sectional views.