Type locality designated as bluffs of Snake River in vicinity of village of Neeley, probably for which unit is named, located 5 mi southwest of American Falls, Power Co, ID, Snake River basin. Consists of about 100 ft of flesh-colored to brown sandy lacustrine deposits and partly reworked tuffs. Overlies Pillar Falls mud flow (new); underlies Eagle Rock tuff (new). Assigned Pliocene? or early? Pliocene age.

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

Redescribed from Neeley lake beds to Neeley formation because gross lithologic character of Neeley is not of a lacustrine deposit. Lower part is a gravel containing pebbles and cobbles of Paleozoic rocks and of vitric-crystal tuff from the Starlight formation which unconformably underlies it. The upper part is a light tan to orange-brown, fine- to coarse-grained rhyolitic tuff, commonly poorly bedded, and a few beds of white marl. Ranges from 30 to 150 ft thick. Mollusk fossils. Underlies Walcott tuff. Assigned a middle Pliocene age. Mapped near American Falls, Power Co, ID, Snake River basin. Geologic map.

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

Pg. 241. Neeley Formation. A massive impure rhyolitic tuff near American Falls, Power Co., eastern Snake River Plain, southern ID. [Based on stratigraphic position, age is considered North American land mammal age Hemphillian; =Pliocene (Evernden and others, 1964, Amer. Jour. Sci., v. 262, p. 145-198), =Miocene (Berggren, 1972, Lethaia, v. 5, no. 2, p. 195-215).] Lies above Starlight Formation, K-Ar ages 6.5 and 7.7 Ma, and below Walcott Tuff, K-Ar age about 6.2 Ma. Report includes sample locality map, schematic stratigraphic-chronologic diagram, table of K-Ar ages.

Source: Publication.