[Rockhounds] At 2.9 Ga, scientists Discover Ancient Traces of The Oldest Glaciers Ever Found

[Paul]

Scientists Discover Ancient Traces of The Oldest Glaciers Ever Found
by Clare Watson, Nature 12 July 2023
https://www.sciencealert.com/scientists-discover-ancient-traces-of-the-oldest-glaciers-ever-found
https://phys.org/news/2023-07-scientists-evidence-world-oldest-glaciers.html

Hofmann, A. and Bindeman, I.N., 2023. Earth's first glaciation at 2.9 Ga
revealed by triple oxygen isotopes. Geochemical Perspectives Letters, 
26, pp.20-24.
https://www.geochemicalperspectivesletters.org/article2319/

Yours,

Paul H.