Ages for Birnessite at GEMCO Mine, Groote Eylandt, East Arnhem Region, Northern Territory, Australia

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 30Ma - 16Ma at this locality

• Mineralization age

• Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
  Scott-EG91_386-0001	18	16		Cryptomelane	K,Mn,Ba	125742	GEMCO Mine, Groote Eylandt, East Arnhem Region, Northern Territory, Australia	Dammer et al. (1996)	EG91_386
  Scott-EG91_386-0002	30	30		Romanechite	Mn,Ba	125742	GEMCO Mine, Groote Eylandt, East Arnhem Region, Northern Territory, Australia	Dammer et al. (1996)	EG91_386