Gabbro of Mount Moffit of the Mount Hayes quadrangle and a correlative unit of gabbro, diorite, metagabbro, metadiabase, and amphibolite dikes, sills and small plutons (units gbm and mgb of Nokleberg and others, 1992a) are distributed along the Denali Fault System in the Mount Hayes quadrangle and also in the adjacent Tanacross and Nabesna quadrangles. In south-central Alaska, we correlate the country rocks of these intrusive rocks with the Yanert Fork sequence of Csejtey and others (1992 (unit Dmvs here) in the Mount Hayes quadrangle, but such correlation is increasingly speculative east of the Mount Hayes quadrangle. Unit also includes medium- to coarse-grained hornblende gabbro, hornblendite, plagioclase-hornblende pegmatite, and tectonized peridotite, informally named the Katzehin ophiolite complex; it is associated with the Coast Plutonic Complex of Brew and Morrell (1979b) in the Atlin quadrangle (Brew and others, 2009) and small peridotite bodies in the Juneau and Taku River quadrangles (Brew and Ford, 1985). In the Atlin quadrangle, these rocks are associated with greenstone and amphibolite. These rocks have an inferred Early Triassic age because they are close to, and may be stratigraphically overlain by, bedded sedimentary rocks of Early and Middle Triassic age (Brew and others, 2009). We suggest these rocks may correlate with other Jurassic or Triassic mafic and intermediate plutons associated with the Coast Plutonic complex of Brew and Morrell (1979b) such as the Texas Creek granodiorite of unit Trqd