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