FIGURE 7. Three-dimensional reconstruction of phycosiphoniform from Rosario Formation, Mexico. 7.1-7.5. Burrow core without the halo. 7.6. Burrow core with surrounding halo. 7.7. Below, Quicktime format video file of rendered reconstruction of the phycosiphoniform burrow core. A higher resolution AVI movie is also available as a zipped file for download.