Name proposed for member of Yakima basalt. Defined as occurring one flow below top of Yakima basalt in Yakima-Ellensburg area, south-central WA. In Squaw Creek syncline, member consists of bed of essentially pure diatomite 7 to 17 feet thick. Conformably underlies lacustrine siltstone (0 to 10 feet thick) which in turn underlies, with slight erosional unconformity, a quartz-rich sandstone and pea conglomerate (0 to 20 feet thick). Diatomite formed in one or more fresh-water lakes of great areal extent. Rests everywhere on basalt, and was overspread by uppermost one or two Yakima flows.
Type locality not stated. Occurs in Yakima-Ellensburg area, south-central WA.
[GNC remark (July 23, 2024): Squaw Creek Diatomite Bed (later Squaw Creek Member of Ellensburg Formation) renamed Lmuma Creek Member of Ellensburg Formation by Sadowski and others (2023) in accordance with the Department of the Interior's Secretarial Order 3404, discontinuing use of derogatory term squaw. See Lmuma Creek.]

Source: GNU records (USGS DDS-6; Menlo GNULEX); US geologic names lexicon (USGS Bull. 1200, p. 3700-3701).

Pg. G8. Squaw Creek Diatomite Bed of Frenchman Springs Member of Yakima Basalt of Columbia River Group. Diatomite, 5 to 17 feet thick; grades westward into sandstone and pebble conglomerate composed of partly tuffaceous and partly of granitic detritus. Underlies Roza Member of Yakima Basalt. Where Squaw Creek is not present, silicified wood or odd-shaped siliceous concretions mark contact between Frenchman Springs Member and overlying Roza Member. Age is late Miocene.
Type section: on Squaw Creek, in T. 15 N., R. 20 E., Kittitas Co., WA.
[GNC remark (July 23, 2024): Squaw Creek Diatomite Bed (later Squaw Creek Member of Ellensburg Formation) renamed Lmuma Creek Member of Ellensburg Formation by Sadowski and others (2023) in accordance with the Department of the Interior's Secretarial Order 3404, discontinuing use of derogatory term squaw. See Lmuma Creek.]

Source: Publication; Changes in stratigraphic nomenclature, 1966 (USGS Bull. 1254-A, p. A7); GNU records (USGS DDS-6; Menlo GNULEX).

Squaw Creek Diatomite Bed (Frenchman Springs Member of Yakima Basalt) (Bingham and Grolier, 1966) and Quincy Diatomite Bed (Priest Rapids Member of Yakima Basalt) are renamed Squaw Creek Member because it is chiefly sandstone and siltstone toward west and is reassigned as middle member of 3 to Ellensburg Formation. Squaw Creek Member merges with Ellensburg Formation to the west. Name Quincy Diatomite Bed is here abandoned because it is apparently equivalent to Squaw Creek Diatomite Bed. Age is middle Miocene [based on stratigraphic relations].
[GNC remark (July 23, 2024): Squaw Creek Member of Ellensburg Formation renamed Lmuma Creek Member of Ellensburg Formation by Sadowski and others (2023) in accordance with the Department of the Interior's Secretarial Order 3404, discontinuing use of derogatory term squaw. See Lmuma Creek.]

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

Pg. 9; geol. map. Name †Squaw Creek Member of Ellensburg Formation herein renamed Lmuma Creek Member in accordance with the Department of the Interior's Secretarial Order 3404, discontinuing use of derogatory term squaw.
[The geographic feature Squaw Creek, from which the name was taken (Mackin, 1961, p. 21), was renamed Lmuma Creek (U.S. Board on Geographic Names, January 1999, USGS GNIS FeatureID 1508662). See entry under Lmuma Creek.]

Source: Publication.