Sample 251
NavDat sample number 29584 · RHYOLITE
Sample
| Sample ID | 251 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Collected by | Supplied by W.A. Duffield |
| Comment | obsidian |
Location
| Latitude | 41.8198 |
|---|---|
| Longitude | -120.895 |
| Location | Steele Swamp |
| State / province | California |
| Volcanic field | Northeast California |
| Location comment | from a chipping ground for ancient artifacts and probable obsidian source. Known to archaeologists as the Steele Swamp source |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 33.4 | 1.8 | 65 | Tertiary |
Analyses
Glass
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| BA | 1130 | PPM | UNKNOWN | |
| CO | 0.3 | PPM | UNKNOWN | |
| CS | 2.5 | PPM | UNKNOWN | |
| HF | 9.5 | PPM | UNKNOWN | |
| NB | 21 | PPM | UNKNOWN | |
| PB | 19 | PPM | UNKNOWN | |
| RB | 60 | PPM | UNKNOWN | |
| RB | 59 | PPM | UNKNOWN | |
| SB | 0.8 | PPM | UNKNOWN | |
| SC | 10.7 | PPM | UNKNOWN | |
| SR | 0.6 | PPM | UNKNOWN | |
| TA | 1 | PPM | UNKNOWN | |
| TH | 6.9 | PPM | UNKNOWN | |
| U | 2.6 | PPM | UNKNOWN | |
| Y | 78 | PPM | UNKNOWN | |
| ZN | 187 | PPM | UNKNOWN | |
| ZR | 364 | PPM | UNKNOWN | |
| LA | 44 | PPM | UNKNOWN | |
| CE | 89 | PPM | UNKNOWN | |
| ND | 45 | PPM | UNKNOWN | |
| SM | 10.7 | PPM | UNKNOWN | |
| EU | 1.89 | PPM | UNKNOWN | |
| GD | 10.4 | PPM | UNKNOWN | |
| TB | 1.8 | PPM | UNKNOWN | |
| TM | 1.1 | PPM | UNKNOWN | |
| YB | 8.8 | PPM | UNKNOWN | |
| LU | 1.25 | PPM | UNKNOWN |