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Sample S92-H265
NavDat sample number 37036 · BASALTIC-ANDESITE
Sample
| Sample ID | S92-H265 |
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| Rock name | BASALTIC-ANDESITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | Outcrop in lava flow exposed on slope east of Dog River. Reversed-polarity. Corresponds to Wise sample locality 110 Wise,1969. This lava, erupted early in the Matuyama Reversed-Polarity Chron, is overlain by normally polarized lava probably the Oduvai Normal-Polarity Subchron of the Matuyama that forms the ramping surface otraversed by Forest Rd 1700-680. Plagioclase 6-7%, olivine 1-2%, and augite 1-2% phenocrysts in an intergranular groundmass of plagioclase, augite, opaque minerals, and traces of phlogopite; some olivine phenocrysts have faint wisps of iddingsite. Chemically and petrographically similar to No 16S92-H269 |
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Location
| Latitude | 45.4335 |
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| Longitude | -121.546 |
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| State / province | Oregon |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 2.06 |
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1.98 |
2.14 |
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Analyses
No chemical analyses are stored for this sample.
