Hallidaya instance of taxon
The Ediacaran fossil Hallidaya, a close relative of Skinnera lived in Belomorian (559-550 Ma) of the Late Ediacaran period prior to the Cambrian explosion and thrived in the marine strata on the ocean floor of what is now considered Australia. These fossils were disk-shaped organisms that were slightly dome shaped with tri-radial symmetry. These Ediacaran organisms thrived by living in low-energy inner shelf, in the wave- and current-agitated shoreface, and in the high-energy distributary systems.Description
The Hallidaya is a species of Skinnera which has the shape of small circular-shaped fossils preserved as a mold.  They are soft-bodied creatures approximately 4–32 mm (0.16–1.26 in) in diameter with an average of 10 mm (0.39 in) with a height of 2 mm (0.079 in) shaped like a dome. They have three central depressions that are connected to smaller pouch-shaped depressions around the perimeter of the disk by canals. The center depressions are speculated to be their stomach.Taxonomy
The Hallidaya is a genus of the Trilobozoa taxon, but their further relationships are incertae sedis. These fossils were mainly disk-shaped organisms with tri-radial symmetry.Discovery
They were found by A.L. Halliday and M.M Bruner near Mount Skinner in Northern Territory, Australia. They marked off three locations and labelled them Mt. Skinner No. 1-3. Most of the fossils found were discovered between locations Mt. S2 and Mt. S3. These fossils were given to Mary Wade who worked in the  Department of Geology at the University of Adelaide. Wade was able to separate the fossils into two types, Form A and Form B with there being twice as many fossils that conformed to Form A when compared to Form B. Wade named Form A Hallidaya brueri and Form B Skinnera brooksi.
type of example of manifestation of representation of