diluting catastrophe

An exercise in uniformitarian dilution of the evidence can be witnessed at http://phys.org/print365932414.html … extinction events are reduced to depletion of vital trace elements. There is a nice graph showing the ups and downs of selenium abundance and the question is asked – could selenium depletion cause mass extinctions? This question is back to front – it should read do mass extinctions also cause selenium depletion (which is the more apt equation).