Canning Formation

Unit symbol: TKcf
Age range lower Tertiary, Oligocene? to Cretaceous, Albian (83.6 to 56 Ma)
Lithology: Sedimentary
Group name: Canning Formation
Consists of gray shale and siltstone containing interbeds of mostly thin-bedded, very fine- to fine-grained lithic sandstone. Unit informally divided in two facies: a turbidite sandstone facies and a slope-and-shelf facies. Turbidite facies are present throughout age range and areal distribution of unit; slope and shelf facies apparently entirely Tertiary in age and present only in eastern part of unit (Bird and Molenaar, 1987). Unit is 1,500 to 1,800 m thick in wells west of the Canning River and thinner to the east (Bird and Molenaar, 1987). Unit becomes younger from west to east: at Canning River it is entirely Cretaceous, in easternmost exposures, unit is Eocene and possibly as young as Oligocene in the subsurface. Lateral equivalent, in part, of the Sagavanirktok (unit Tsf) and Prince Creek Formations (unit TKpc). Unit is a time-transgressive turbiditic sandstone and shale as described by Molenaar and others (1987) and is recognized on the surface only in northeastern Alaska. In the subsurface west of the Canning River, unit may be equivalent to the Torok Formation (unit Kto, here; Molenaar and others, 1987). To the east and offshore, Houseknecht and Schenk (1999) suggest the Canning Formation may become as young as Miocene

Source map information

Source map Reiser, H.N., Brosge, W.P., Dutro, J.T., Jr., and Detterman, R.L., 1971, Preliminary geologic map, Mt. Michelson quadrangle, Alaska: U.S. Geological Survey Open-File Report 71-237, 2 sheets, scale 1:200,000.
Symbol Kc
Unit name Sandstone and Shale
Description Includes thin sandstone and conglomerate (similar to Ignek Sandstone) above the pyroclastic shale rocks, and organic shale below the pyroclastic rocks. Equivalent to upper member of the Ignek Formation of Keller et al 1961, and to part of the Colville Group.
Lithology Sedimentary

Correlated geologic units

Label TKcf
Description Canning Formation, basinal turbidite deposits
Geologic age Campanian to Paleocene
Geologic setting Sedimentary, slope-and-deep-water
Lithology Form Importance
Shale < Mudstone < Clastic < Sedimentary Bed Major
Siltstone < Clastic < Sedimentary Bed Major