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Upper Colville River, Alaska

        Upper Colville Fossil Images Unassigned Fossil Images 85JTP08

 

This interactive map of part of the Colville River, Northern Alaska, shows the locations of plant fossil collections made by J.T. Parrish and R.A. Spicer in 1985 and 1989. Click on a number for more details on that site. The red outlined area links to another map showing positions of florules (plant fossil assemblages) collected by C.J. Smiley along both the Colville and Chandler Rivers.

Interactive map of the Upper Colville River Hotspot linking to 85RAS09 Hotspot linking to Smiley's Colville and Chandler River localities. Hotspot linking to 85RAS02 Hotspot linking to 85RAS01 Hotspot linking to 85RAS03 Hotspot linking to 85RAS04 Hotspot linking to 85RAS05 Hotspot linking to 85RAS06 Hotspot linking to 85RAS07  Hotspot linking to 85RAS08 Hotspot linking to 85RAS10 Hotspot linking to 85RAS11 Hotspot linking to 85RAS12 Hotspot linking to 85RAS13 Hotspot linking to 85RAS14 Hotspot linking to 85RAS13 Hotspot linking to 85RAS16 Hotspot linking to 85RAS17 Hotspot linking to 85RAS18 Hotspot linking to 85RAS19 Hotspot linking to 89RAS1_3 Hotspot linking to 89RAS04 Hotspot linking to 89RAS05 Hotspot linking to 89RAS06 Hotspot linking to 89RAS07 Hotspot linking to 89RAS09 Hotspot linking to 89RAS10 Hotspot linking to 89RAS11 Hotspot linking to 89RAS12 Hotspot linking to 89RAS164_320

Locality 85JTP08

This locality is an exposure of the Cenomanian Niakogan Tongue of the Chandler Formation (Chapman et al., 1964), now the upper part of the Nanushuk Formation of Mull et al. (2003). The sediments are predominantly bentonitic clays with siderite nodules, and fine sandstones. The plant fossils are mostly found in the ironstone which occurs both as sheets and nodules, but platanoid leaves occur in the sandstones. The ironstones yield numerous taxodioid conifers, digitate ginkgos, Podozamites, ferns such as Asplenium and Gleichenites, the cycad Nilssonia as well as angiosperms such as Dalembia, Araliaephyllum, Ettingshausenia and some indeterminate monocots. Large pieces of wood, including trunk wood and tree bases are common.

The following a is a summary of the lithologies in the succession logged by J.T.Parrish in July 1985.

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  0.6 m Sandstone
  1.5 m Mudstone
  3 m Sandstone with abundant logs
  1.8 m Coaly shale
  2.4 m Mudstone
  5.5 m Sandstone
  5.8 m Gray mudstone, disappears along strike
  0.43 m Concretionary claystone layer
  0.15 m Claystone
  0.76 m Cover
  1.1 m Muddy siltstone
  0.7 m Sandstone
  1.4 m Siltstone and claystone
  0.73 m Sandstone
  8.8 m Cover
  1.5 m Prominant sandstone in the river bed with Equisetites rhizomes

 

Hotspot linking to Smiley's Colville and Chandler River localities. Hotspot linking to localities along the Kukpowruk River Hotspot linking to the Kuk River Localities