Dominantly pelitic and quartz-rich schist and quartzite in the Mount Hayes (Nokleberg and others, 1992a), Healy (Csejtey and others, 1992), and Mount McKinley (Bela Csejtey, Jr., written commun., 1993) quadrangles; includes subordinate calc-schist and feldspathic schist. Generally underwent greenschist to amphibolite facies metamorphism, with or without greenschist facies retrogression. Unit is lithologically similar to units PzPxyqs and PzPxyqm in the Yukon-Tanana Upland; all three units contain metaigneous rocks that yield Devonian zircon ages