Geirud Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Geirud Formation
RTDevonian
 Carboniferous
 Permian
 Iran
 Elburz
SNUpper Devonian, Carboniferous and possibly Lower Permian. Central Elburz Mountains in N Iran. Indexed with ages as applicable.