Schist recrystallized in part to greenschist metamorphic facies mineral assemblage of albite-epidote-chlorite-actinolite. Schist contains interbeds of thin-bedded, white or green metachert that contains white mica-rich laminae (Box and others, 1993); overlain by crystalline limestone, phyllite, and minor amounts of chlorite, graphite, and quartz-sericite schist (Hoare and Coonrad, 1959a). Mapped as Mesozoic to Paleozoic metabasalt and minor metachert (MzPzb) by Box and others (1993); protolith was diabase and basalt that had “trace-element chemical compositions of lavas are similar to modem mid-ocean ridge basalts and range from light REE-depleted to slightly light REE-enriched varieties” (Box and others, 1993). Although protolith age is unknown, it was suggested to be Devonian to Ordovician by Hoare and Coonrad (1959a). Unit is bounded on west by the Golden Gate Fault; nearshore facies of the Kuskokwim Group (Kkn) depositionally overlie unit at the north end of its exposure. Age of metamorphism may be Late Jurassic based on a K/Ar age of 146.0±15.0 Ma on actinolite. MzPzgs is physically separate from the other rocks of this group; Box and others (1993) inferred that a thrust fault placed the other rocks of the anticlorinorium structurally over this schist