Lower Colville River, Locality 86/45
|Northern Alaska Map|
Kogosukruk Tongue of the Prince Creek Formation. This succession is immediately above that at locality 86/44. At the base of the section is a heavily rooted olive green-gray mudstone of indeterminate thickness, partly covered by slope wash. This is overlain by a carbonaceous dark gray clay unit (approximately 30 cm thick) with abundant carbonized plant fragments near its base and in discreet layers above. Above this the clay becomes very dark brown and more silty for about 25 cm but has a 7.5 cm thick lighter cream colored bentonitic layer in the middle of it. This unit is overlain by a 7.5 cm thick silt or fine sand. A brown silty clay overlies this layer, again with plant fragments,is approximately 15 cm thick, and forms the seat earth of a thin (2.5 cm) dirty coal that passes up into a more indurated 7.5 cm thick dirty coal. This is overlain by a rooted biege mudstone with an uneven (eroded?) top. This unevenness could be due to compaction because above the beige (bleached?) mudstone is a very dark brown dirty coal 10 cm thick. Above the coal is a chocolate brown to gray rooted clay with abundant plant fragments.
|Interactive map of the lower reaches of the Colville River showing plant fossil localities sampled by Smiley (1969) and by Parrish and Spicer in 1986.|
|Part of the exposure of the Prince Creek Formation (formerly the Kogosukruk Tongue of the Prince Creek Formation) on the western side of the Colville River between Uluksrak Bluff and Ocean Point.|