[meteorite-list] selenium concentrations// an indicator of impact?

[drtanuki]

Dear List,
  Selenium is an available marker for impact geology.  Some plants are indicators for selenium-rich soils and these indicator plants should be noted when searching for impact crater ejecta.  
Best Always, Dirk Ross...Tokyo

http://www.webelements.com/selenium/geology.html

Abundances for selenium in a number of different environments. Use the links in the location column for definitions, literature sources, and visual representations in many different styles (one of which is shown below) Location ppb by weight ppb by atoms 
Universe 30  0.5  
Sun no data  no data  
Meteorite (carbonaceous) 13000  2900  
Crustal rocks 50  10  
Sea water 0.45  0.035  
Stream 0.2  0.003  
Human 50  4