Petrogenic Definition
    adjective
  
 Of or pertaining to the formation of rock.
Wiktionary 
(of hydrocarbons etc) Produced by the incomplete combustion of petroleum.
Wiktionary 
Origin of Petrogenic
- Ancient Greek πέτρος (petros, “rock”) + -genic - From Wiktionary 
-  petrol + -genic From Wiktionary 
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