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Upper Colville River, Alaska

Map of Northern Alaska       Upper Colville Fossil Images Unassigned Fossil Images

 

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 89JTP04

Description:

This locality is the same as 85JTP05. Nilssonia and large Ginkgo leaves were found to be common at this site.

A basal sandstone is heavily rooted with abundant plant hash as is an overlying gray/brown claystone with nodular ironstone concretions. The concretions contain abundant branch wood at all angles and not alinged parallel to bedding. These ironstones are just a cemented version of the clays and contain numerous conifer leaf fragments. A sample from the seat earth of a coal contains numerous broad ginkgophyte leaves but they could equally be Podozamites (they are too incomplete to tell). Immediately beneath the seat earth of the coal is a gray brown clay with abundant conifer needles of the Cephatotaxopsis type and a few Equisetites fragments. Ginkgophyte (?) leaves are rare. In a clay within the coal Pityophyllum and "Podozamites?"are abundant. The "Podozamites" leaves could equally be Podozamites or ginkgophyte fragments, preservation is poor. Another clay above the coal is rooted and contains Cephalotaxopsis. Above this is a sandstone with logs and branches and horizons with comminuted plant hash. Sample 89RAS96 was collected from sandstone float at the east end of the section just below a marine transition.

Aerial photograph of 89JTP05 which is at the right hand side of the image
 
Aerial photograph of the 'amphitheater' exposure where locality 89JTP04 is situated at the left hand side of the image.

 

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