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 Keller, A.S., Morris, R.H., and Detterman, R.L., 1961, Geology of the Shaviovik and Sagavanirktok Rivers region, Alaska, in Exploration of Naval Petroleum Reserve No. 4 and adjacent areas, northern Alaska, 1944-1953, Part 3, Areal Geology: U.S. Geological Survey Professional Paper 303-D, p. 169-222, 6 plates, scale 1:63,360.
Symbol Kiu
Unit name Upper member of the Ignek Formation
Description The member may be divided into two parts: a lower unit characterized by bentonite and beds of silicified tuff and an upper unit composed of conglomerate, sandstone, siltstone, and shale. Locally, pebbles of black chert are aligned along the bedding planes. Multicolored silicified tuff beds crop out on the west side of the Canning River several hundred feet higher than the sandstone. The upper part of the upper member overlies beds of red ocher and comprises conglomerate, fine- to coarse-grained relatively clean salt-and-pepper sandstone, medium-gray carbonaceous coaly siltstone, and shay siltstone. Abundant coaly wood, partly silicified, logs, plant remains, and ironstone nodules are present, and fucoidal and mudflow markings locally characterize the sandstone and siltstone. The outcrop belt of the upper member typically is one of low relief with the best exposures along the lower part of the Canning River and in the icefield areas on the Kavik River and Juniper Creek. The beds of the upper member overlie the lower member with unknown attitude. Locally, the upper member rests directly on rock of Berriasian age. The upper member is overlain by the Sagavanirktok formation.
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