[Named for occurrence in valley of Strelna Creek, Kotsina-Kuskulana district, Copper River region, southern AK.] Rocks were formerly part of Nikolai greenstone, now separated as Strelna formation, name Nikolai being applied to coarse-grained and generally amygdaloidal lavas overlying Strelna. Is complex of bedded lavas and tuffs intercalated with sedimentary beds and cut by basic intrusive rocks. Consists chiefly of stratified tuff beds and dense fine-grained basalt with minor chert, argillite, shale, and limestone. Thickness is 7000 to 8000 ft, possibly 10,000 ft. Conformably(?) underlies Nikolai greenstone. Is oldest unit in columnar section of district. Poorly preserved fossils indicate Mississippian according to G.H. Girty.

Source: GNU records (USGS DDS-6; Menlo GNULEX).

Type locality [designated] as Strelna Creek in Chitina Valley, Copper River plateau [McCarthy quad] southern AK. Unit is geographically extended to north side of Chitina River as far east as mouth of Nizina River and to mountains south of Chitina River as far east as Tana River.

Source: GNU records (USGS DDS-6; Menlo GNULEX).

Unit abandoned; its strata in type locality at Strelna Creek assigned to Hasen Creek Formation.

Source: GNU records (USGS DDS-6; Menlo GNULEX).