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Sample USGSD-Dodgson Creek
NavDat sample number 10040 · TONALITE
Sample
| Sample ID | USGSD-Dodgson Creek |
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| Rock name | TONALITE |
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| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | medium to fine grained, uniformly textured, dark-bluish-gray; equant and euhedral hornblende and biotite show against background of plagioclase and quartz; no primary foliation; sample from near intrusive contact; DATES GIVEN BY HORNBLENDE ARE SPURIOUS; ZIRCON DATE IS TOO YOUNG |
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Location
| Latitude | 45.8686 |
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| Longitude | -112.992 |
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| Location | outcrop at 7100 ft elevation on ridge between Dodgson Creek and a tributary to the east; Silver Bow County |
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| State / province | Montana |
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| Volcanic field | Pioneer Batholith |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 61.8 |
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52.7 |
61.8 |
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Analyses
No chemical analyses are stored for this sample.
