Shuram excursion

The Shuram excursion, or Shuram-Wonoka excursion, is a change in δ13C, or in the ratio of carbon-13 to carbon-12, starting around 551 million years ago during the Ediacaran Period. It was first noticed in the Wonoka Formation in South Australia in 1990 and later in the Shuram Formation in Oman in 1993.[1] It is the largest negative δ13C excursion in Earth history, and recovery took 50 million years.[2]

It is not known what caused the excursion. It may have played a role in sparking the rise of animals that resulted later in the Cambrian explosion.[3]


  1. ^ George Williams and Phillip Schmidt (Mar 2018). "Shuram–Wonoka carbon isotope excursion: Ediacaran revolution in the world ocean's meridional overturning circulation". Geoscience Frontiers. doi:10.1016/j.gsf.2017.11.006.
  2. ^ Erwan Le Guerroué; et al. (Apr 2006). "Chemostratigraphic and sedimentological framework of the largest negative carbon isotopic excursion in Earth history: The Neoproterozoic Shuram Formation (Nafun Group, Oman)". Precambrian Research. doi:10.1016/j.precamres.2006.01.007.
  3. ^ Colin Barras (Nov 9, 2019). "The weird creatures that might be the very first complex animals". New Scientist.

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