Additional K–Ar isotopic dates for the Carmacks Group (Upper Cretaceous), west central Yukon

• Published in: Canadian Journal of Earth Sciences
• Main Authors: Lowey, G. W., Sinclair, W. D., Hills, L. V.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1986
• Subjects: General Earth and Planetary Sciences; Yukon; Indian; Carmacks; Sixty Mile River
• Online Access: http://dx.doi.org/10.1139/e86-171; http://www.nrcresearchpress.com/doi/pdf/10.1139/e86-171

Three whole-rock K–Ar analyses on andesites from the Indian River area, west central Yukon, yielded dates of 69.0 ± 1.7, 65.2 ± 1.7, and 64.8 ± 1.7 Ma. These confirm earlier dates indicating the Carmacks Group is Late Cretaceous in age. A single date of 51.4 ± 3.9 Ma was obtained from a tuff in the...