Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org

Ages for Coffinite at Jefferson Co., Colorado, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 70.4Ma - 68.2Ma 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
Giersdorf_00000890	70.4	68.2			U	6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858

Mineralization age (prioritized)

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
Giersdorf_00000890	70.4	68.2			U	6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858

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
Giersdorf_00000883	67.9	63.1				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000884	73.9	65.3				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000885	94	70				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000886	78	52				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000887	92	52				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000888	81	59				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000889	98	48				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000891	72.2	67.6				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
Giersdorf_00000892	1860	1600				6282	Schwartzwalder Mine (Ralston Creek Mine), Ralston Buttes District, Jefferson Co., Colorado, USA	Ludwig et al. (1985)	EG80_1858
ree-00688	1010	1010				66693	South Platte Pegmatite District, Jefferson Co., Colorado, USA	Orris and Grauch (2002)	USGSOFR02_189
USGS-Rb-Sr-04308	1743.92	1603.92				6280	Roscoe Beryl Mine (Roscoe Pegmatite), Clear Creek Pegmatite Province, Jefferson Co., Colorado, USA	USGS-Rb-Sr	USGS-Rb-Sr

Locality age (remote)

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
Bradley_2012_132	1079	1075				3668	Pikes Peak, El Paso Co., Colorado, USA	McCauley and Bradley (2014)	CM52_183