Hailey conglomerate member of Wood River formation. Comprises gradation upward from immature graywackes to supermatare orthoquartzites. Thickness, 1,900 feet. Late Morrowan where it interfingers with limestones east of Muldoon trough; in the west, upper boundary is Desmoinesian. Older than Slate Creek member (new); overlies Muldoon formation (new).
[Type locality not stated.] Deposited in Muldoon trough, aligned N. 30 deg. W., Bellevue area, ID.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1645).

Pg. 1427 (fig. 3). Hailey conglomerate member of Wood River formation. Correlation chart shows the Hailey at base of Wood River formation in Bellevue area, Idaho. Underlies unnamed lower sandy limestones of formation; unconformable above Milligen formation. Age is Pennsylvanian (Morrowan through Derryan).

Source: US geologic names lexicon (USGS Bull. 1200, p. 1645).

Hailey Conglomerate Member of Wood River Formation. Hailey Conglomerate Member of Thomasson (1959a,b) adopted as lowermost (unit 1) of seven units of Wood River Formation. Thick-bedded or massive, chert pebble conglomerate, and brown, fine-grained, sandy limestone. Thickness 395 to 986 feet. Disconformably overlies Milligen Formation; conformably underlies unnamed unit 2. Fossiliferous (fusulinids, green algae). Age is considered Middle Pennsylvanian.
Type section: at west end of bridge over Big Wood River at Hailey, Blaine Co., south-central ID.
M.R. Thomasson, 1959a, Dissert. Abs., v. 20, no. 3, p. 999.
M.R. Thomasson, 1959b, Madison, Univ. Wisconsin, PhD thesis, 244 p.

Source: Changes in stratigraphic nomenclature, 1974 (USGS Bull. 1405-A, p. A10-A11); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).

Upward and eastward transport of Grand Prize Formation (a new name) over the Paleozoic Salmon River assemblage caused intense brecciation that formed a breccia as much as 300 m thick. This breccia was formerly assigned to Hailey Conglomerate Member of Wood River Formation at Slate Creek and Fourth of July Creek in the Boulder Mountains. Is of Middle Pennsylvanian age.

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

Hailey Member of Wood River Formation. Revised to include the interfingering thin bioclastic limestone (= unit 2 of Hall and others, 1974). Consists of light-brown to light-gray conglomerate, 0 to 180 m thick, gradationally overlain by bluish-gray bioclastic limestone, 15 to 30 m thick. Total thickness 0 to 200 m. Correlates with lower members of Grand Prize and Dollarhide Formations of Sun Valley. Unconformably overlies Devonian Milligen Formation. Underlies Eagle Creek Member (new; = units 3, 4, 5, and 6 of Hall and others, 1974) of Wood River Formation; contact placed at first distinctive light purple micrite of the Eagle Creek. Age is Middle Pennsylvanian, based on fossils (corals, fusulinids, green algae).
Type section: lower 180m of the principal reference section east of Bellevue (Hall and others, 1974, p. 90; Section W5 of fig. 4).
Principal reference section: along ridge at Seamans Creek, in T. 3 N., R. 19 E., Blaine Co., ID.

Source: Publication; GNC index card files (USGS-Menlo); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).