Cave Creek Alluvium. Deposits form bed of Cave Creek. Alluvium consists of tan, grayish-tan, brown, unconsolidated, moderately- to locally well-sorted, well-bedded modern channel deposits. Finer fraction composed of coarse-grained gravel (73 percent), coarse-grained sand (22 percent), and minor silt (4 percent); contains well-rounded to sub-rounded clasts up to 4.5 feet in diameter (Kenny, 1986). Total thickness ranges from 0 to 5 feet, locally up to 10 or 20 feet. Well 150, southwest of Black Mountain, has penetrated 100 feet of unconsolidated sediment, though lower 65 feet are probably alluvium of Paradise Valley. Unconformably overlies Precambrian meta-argillite-phyllite complex and Middle Proterozoic (1400 Ma) Go John Diorite (new), Miocene volcanic rocks, upper Miocene and lower Pliocene (<13.4 Ma) Galloway and Naked Girl Canyon Members of the Carefree Formation (all new). Age is Holocene. Report includes geologic map, cross section, stratigraphic nomenclature table.
Type locality: in Cave Creek bed, town of Cave Creek, Cave Creek quadrangle, northern Maricopa Co., central AZ. Named from Cave Creek.

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