Eocene animal trace fossils in 1.7-billion-year-old metaquartzites.
Proc Natl Acad Sci U S A. 2021 Oct 5;118(40):e2105707118. doi: 10.1073/pnas.2105707118. Proc Natl Acad Sci U S A. 2021. PMID: 34580219 Free PMC article.