Named for White Eagle mine, northwestern side of Lone Mountain, Cave Creek quad, northern Maricopa Co, central AZ. Exposed discontinuously along northern boundary of Carefree basin from Lone Mountain to west of Little Elephant Mountain. Consists of white to light-gray to reddish-tan, fine-grained, well-bedded, poorly to moderately consolidated, locally calcareous lake bed deposit consisting of interbedded layers of mudstone, siltstone, tuffaceous sandstone, and pods of white and red chert. Thickness varies from 3 to 6 feet at Spur Cross Rd, to approx. 115 feet at White Eagle mine. Interbedded with basalt flows at Lone Mountain and at type locality; overlies andesite between Fleming Springs Rd and Cave Creek; locally unconformably overlies Precambrian meta-argillite--phyllite complex in upper Grapevine Wash. Where not capped by basalt, overlain by late Miocene and early Pliocene Naked Girl Canyon Member of Carefree Formation (both new) or by Pleistocene Schoolhouse Glacis Alluvium (new). Correlates with "carbonates" of Chalk Canyon formation [informal?] of Jagiello (1987) in hills west and northwest of study area. May also correlate with lake beds in alluvial sequence north of study area (Gomez and Elston, 1978). Age is Miocene. Lower part ranges from 21.7 to 15.4 Ma; age of upper part ranges from 15.4 to 13.4 Ma, based on ages of underlying and overlying basalts. Plant and worm burrow fossils and mudcracks locally present. Interpreted as freshwater-lake deposit (Kenny, 1986). Report includes geologic map and cross section, correlation chart, stratigraphic column, and stratigraphic nomenclature table.

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