Early debut for essential gas was followed by an unexpected dip.
This is a preview of subscription content, access via your institution
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Rent or buy this article
Prices vary by article type
Prices may be subject to local taxes which are calculated during checkout
Lyons, T. & Reinhard, C. Nature 461, 250–253 (2009).
Rasmussen, B. et al. Nature 455, 1101–1104 (2008).
Anbar, A. et al. Science 317, 1903-1906 (2007).
About this article
Cite this article
Lubick, N. Chromium isotopes track oxygen's rise. Nature (2009). https://doi.org/10.1038/news.2009.901