Abstract
Paleomagnetic vectors and magnetic susceptibility data are reported from a section at Ch'ijee's Bluff on the banks of the Porcupine River, Yukon Territory. The site is an important natural archive for the study of the last interglaciation in North America (isotope stage 5), and has been intensively investigated. The particular section covered by this report contains the Old Crow tephra (OCt), which is an important chronostratigraphic marker in Yukon and Alaska. The most significant finding is the identification of the Biwa I (=Jamaica) subchron 2–3 m below the OCt. Smaller scale geomagnetic (secular variation) features are also found, and these have potential for lateral correlation, as well as being of interest to geomagnetists due to the high latitude of the site. A zone of distinctly shallower inclinations occurs near the OCt, and can be matched to a similar zone found at a site along the Old Crow River, more than 40 km away. Magnetic susceptibility profiles also appear to correlate over distances of tens of kilometres, and may thus provide useful confirmation of interpretations based on other data.
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