Potassium-Argon Age of Devils Tower, Wyoming
Abstract
Devils Tower consists of columnar phonolite porphyry which contains large phenocrysts of orthoclase. Potassium-argon determinations on the orthoclase indicate an age of 40.5 million years ± 4 percent. This is consistent with the geologically accepted Tertiary age.
- Publication:
-
Science
- Pub Date:
- October 1961
- DOI:
- 10.1126/science.134.3487.1373
- Bibcode:
- 1961Sci...134.1373B