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 Spessartine at San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 102.4Ma - 93.1Ma at this locality

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_00000330	102.4	94.4				6785	San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USA	Fisher et al. (1999)	RM73_156
Giersdorf_00000331	101.1	93.1		Muscovite		6785	San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USA	Fisher et al. (1999)	RM73_156