Named for Gable Creek, major tributary to Bridge Creek, Mitchell quad, Wheeler Co, OR. Previously referred to as part of Mitchell beds. Complex intertonguing with Hudspeth Formation (new) and details of contacts are shown in reference sections on southeast flank of Mitchell anticline. Principal reference section terminal point designated at NE/4 NE/4 SE/4 sec.2 T12S R21E, Mitchell quad. Consists of series of 11 numbered conglomerate and sandstone beds or tongues predominantly of fluvial and deltaic origin. Thickness is up to 700 ft for tongue 9. Shown on sketch map of Cretaceous rocks in south half of Mitchell quad, central OR. Underlies Clarno Formation. Overlies and intertongues with Hudspeth Formation. Is Cretaceous age based on fossils of Albian to possibly Cenomanian age.

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