Here time resolved means not just dated, but having a definitive "shape" through time (the temporal analog to "resolving" an astronomical object to more than ju

Here time resolved means not just dated, but having a definitive "shape" through time (the temporal analog to "resolving" an astronomical object to more than just a single pixel). As others have pointed out, supernova derived Fe-60 merely 'dating' to 2 million years ago was already known.[1] Supporting quote from the abstract: >Our results show that the (60)Fe signal onset occurs around 2.6 Ma to 2.8 Ma, near the lower Pleistocene boundary, terminates around 1.7 Ma, and peaks at about 2.2 Ma. [1] http://physicsworld.com/cws/article/news/2002/feb/13/supernova-link-to-ancient-extinction http://physicsworld.com/cws/article/news/2002/feb/13/superno...