| Abstract: | A block of pitchstone in the northern Black Hills, South Dakota, is Paleocene in age, according to potassium-argon dating of biotite and fission-track dating of zircon in the sample. These data invalidate published suggestions that the age is much younger. The pitchstone is not extrusive in its present position but instead is in a volcanic pipe with other fragments that came downward from as much as 1100 meters above the modern surface. |
| Genre: | Article |
| ProdID: | 70011208 |
| Citation Author: | Redden, J. A.; Obradovich, J. D.; Naeser, C. W.; Zartman, R. E.; Norton, J. J. |
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| Citation End Page: | 1154 |
| Citation Issue: | 4602 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 2 |
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| Citation Search Results Text: | Early tertiary age of pitchstone in the Northern Black Hills, South Dakota; 1983; Article; Journal; Science; Redden, J. A.; Obradovich, J. D.; Naeser, C. W.; Zartman, R. E.; Norton, J. J. |
| Citation Start Page: | 1153 |
| Citation Volume: | 220 |
| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | Early tertiary age of pitchstone in the Northern Black Hills, South Dakota; 1983; Article; Journal; Science; Redden, J. A.; Obradovich, J. D.; Naeser, C. W.; Zartman, R. E.; Norton, J. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1983 00:00 -0600 |
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