Prince Creek Formation

Unit symbol: TKpc
Age range lower Tertiary, Paleocene, to Upper Cretaceous, Campanian (83.6 to 56 Ma)
Lithology: Sedimentary
Group name: Prince Creek Formation
Consists of light colored nonmarine sandstone interbedded with carbonaceous mudstone, coal, and bentonite (Mull and others, 2003). Sandstone is dominantly very fine- to fine-grained and variably tuffaceous and contains grains primarily of quartz and black to gray chert (Mull and others, 2003). Lower part of formation contains distinctive beds of medium- to coarse-grained sandstone that locally contains lenses of pebble to cobble conglomerate. According to Mull and others (2003), unit represents a fluvial, meandering stream environment with interbedded marginal- and shallow-marine intervals. Includes dinosaur-bone-bearing beds at Ocean Point on the Colville River. Includes rocks of the now-abandoned Kogosukruk Tongue and the lower part of the Sagwon Member of the Sagavanirktok Formation as revised by Mull and others (2003) in northern Alaska. Unit originally included two nonmarine tongues, the lower of which is now defined as the Tuluvak Formation (unit Ktu herein)

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 Kcp
Unit name Sandstone, Siltstone, Salt and Pepper Sandstone
Description Sandstone, siltstone, salt and pepper sandstone: with wood fragments and coal. Weathers gray to brown. Probably in part equivalent to Prince Creek Formation.
Lithology Sedimentary

Correlated geologic units

Label TKpc
Description Prince Creek Formation, shelf deposits, restricted to only old Kogosukruk tongue
Geologic age Campanian to Paleocene
Geologic setting Sedimentary, continental
Lithology Form Importance
Sandstone < Clastic < Sedimentary Bed Major
Claystone < Mudstone < Clastic < Sedimentary Carbonaceous Indeterminate, major
Bentonite < Claystone < Mudstone < Clastic < Sedimentary Bed Indeterminate, major
Coal < Sedimentary Bed Incidental