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Sample 35-42
NavDat sample number 8439 · PHONOLITE
Sample
| Sample ID | 35-42 |
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| Rock name | PHONOLITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | porphyritic; phenocrysts of sanidine, Na-ferroaugite, natrolite pseudomorphs of nepheline, melanite, and sphene; groundmass of microcrystalline sanidine, acicular Na-ferroaugite, dolomite, magnetite, and apatite |
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Location
| Latitude | 44.5403 |
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| Longitude | -104.5 |
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| Location | Bear Lodge Mountain igneous complex |
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| State / province | Wyoming |
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| Volcanic field | Lytle Creek area |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 42 |
|
36.7 |
63.5 |
|
|
