21 Dec 2016

Publication: Molybdenum interacts directly with organic matter in sulfidic environments

Molybdenum is one of the most powerful elements used to track hydrogen sulfide and oxygen in the ocean from the geological record. Still, we have an incomplete understanding of the chemical removal pathway between ocean and sediments.  Sediments deposited under anoxic and sulfidic waters display tight correlations between their contents of molybdenum (Mo) and total organic matter  (TOC). Yet, association does not mean causation. Instead, […]

15 Aug 2016

Article in PNAS: Humble moss created modern O2 levels

In a new modeling study led by Tim Lenton from University of Exeter, we found that the earliest land plants caused atmospheric O2 levels to increase above the “fire limit”, where stuff will ignite and burn. This result fits nicely with available geochemical and paleontological evidence, but previous theoretical models predicted either an earlier or a later rise of […]

30 Apr 2016

New release, Evidence for high pO2

April 20 Evidence for high pO2 ~1400 Myrs, communication in PNAS. pdf