Potassium-Argon Age of Devils Tower, Wyoming

@article{Bassett1961PotassiumArgonAO,
  title={Potassium-Argon Age of Devils Tower, Wyoming},
  author={William A. Bassett},
  journal={Science},
  year={1961},
  volume={134},
  pages={1373 - 1373}
}
Devils Tower consists of columnar phonolite porphyry which contains large phenocrysts of orthoclase. Potassiumargon determinations on the orthoclase indicate an age of 40.5 million years � 4 percent. This is consistent with the geologically accepted Tertiary age. 
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References

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The constants Xe and x8, were calculated from radiochemical data by
The work reported here was conducted under the auspices of the U.S. Atomic Energy Commission
This work was supported by U.S. Public Health Service research grant No. RG 7494. References and Notes