Great virtual talk about using biomarkers to determine the
presence of sponges in the Neoproterozoic.

What are the major sources of Neoproterozoic C30 steranes?
Gordon Love, University of California, Riverside
Virtual Seminars in Precambrian Geology, December 2, 2021
[www.youtube.com]
[www.youtube.com]

In addition, starting at 53:30, Dr. Love presents very specific arguments about
why cholestane biomarker recovered from fossils of White Sea Dickinsonia
fossils are Quaternary contaminates and are not in any way associated with
them. If so, this renders the arguments about whether the cholestane
biomarker indicates Dickinsonia is an animal rather moot.

A Fossil Forum post is “Dickinsonia steroids not unique to animals.”
[www.thefossilforum.com]

The original papers are:

Bobrovskiy, I., Hope, J.M., Ivantsov, A., Nettersheim, B.J., Hallmann, C. and
Brocks, J.J., 2018. Ancient steroids establish the Ediacaran fossil Dickinsonia
as one of the earliest animals. Science, 361(6408), pp.1246-1249.
[www.researchgate.net]

Retallack, G.J., 2022. Damaged Dickinsonia specimens provide clues to
Ediacaran vendobiont biology. Plos one, 17(6), p.e0269638.
[journals.plos.org]

More of Bobrovskiy’s papers.
[www.researchgate.net]

More of Rettalack’s papers.
[www.researchgate.net]

Yorus,

Paul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)



Edited 1 time(s). Last edit at 08/18/2022 03:51PM by Paul H..