biography
| name: |
Pirsson, Louis V(alentine)
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| sex:
| male
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| lived:
| (1860–1919)
|
| biography:
| Geologist, born in New York City, New York, USA. He taught at the Sheffield Scientific School at Yale (1882–1919), while spending summers doing fieldwork in Montana and New Hampshire for the US Geological Survey. A pioneer in petrology, he devised a new system of classifying igneous rocks. |
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