Ages for Calcite at Hill Co., Montana, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 83.6Ma - 42Ma at this locality

• Age range from children

• 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
  Michelle_574	83.6	72.1		Whewellite		30928	Havre, Hill Co., Montana, USA	Pecora and Kerr (1954)	AM39_208
  NAVDAT-30377	54	42				164302	Rocky Boy Stock Occurrence, Hill Co., Montana, USA	NAVDAT	NAVDAT

• Locality 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
  Michelle_574	83.6	72.1		Whewellite		30928	Havre, Hill Co., Montana, USA	Pecora and Kerr (1954)	AM39_208
  NAVDAT-29747	56.6	48.4				164302	Rocky Boy Stock Occurrence, Hill Co., Montana, USA	NAVDAT	NAVDAT
  NAVDAT-30343	54	42				163603	Nepheline Occurrences, Hill Co., Montana, USA	NAVDAT	NAVDAT
  NAVDAT-30377	54	42				164302	Rocky Boy Stock Occurrence, Hill Co., Montana, USA	NAVDAT	NAVDAT
  NAVDAT-30378	54	42				163603	Nepheline Occurrences, Hill Co., Montana, USA	NAVDAT	NAVDAT