Outcrop or artificial surface exposure, Biotite gneiss
| Geographic location |
-106.15, 41.3
106°
9'
"
W,
41°
18'
"
N
Albany county,
WY
Centennial
1:24,000 scale map quadrangle
Accurate to within 5 minute (~5 miles)
WEST OF CENTENNIAL
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Biotite gneiss |
| Laboratories | Lamont (Columbia University) |
| Compiler name | Marvin, R.F. |
| Date compiled | 1974 07 |
| Precision of location | Accurate to within 5 minute (~5 miles) |
| Location comment | WEST OF CENTENNIAL |
| Bibliographic reference | Giffin, C.E., and Kulp, J.L., 1960, Potassium-argon ages in the Precambrian basement of Colorado: Geological Society of America Bulletin, v. 71, p. 219-222 |
| (click for info) | |
| Geologic map unit | -106.15, 41.3 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 1,497.85 ± 60Ma minimum age of metamorphic crystallization
|
|---|---|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | PUF-27B |
| Decay constants | 4.72E-04, 0.584E-04, 1.19E-04* |
| K2O concentration | 9.26 % |
| Radiogenic 40Ar concentration | 311.2 |
| Radiogenic Ar | 97 % |