|North Pacific||AKSR-NASR||Anadyr-Koryak||Verkhoyansk-Chukotka||Okhotsk-Chukotka||N. Alaska||Yukon||Chignik|
Northern Alaska (NASR)
This chart shows the relative positions of the phytostratigraphic horizons found in northern Alaska, the associated chronostratigraphy and regional taphofloras.
Clicking on the taphoflora symbols takes you to pages illustrating the material that is typical of those taphofloras.
Clicking on the divisions of the Floras column takes you to descriptions of the different phases of floral evolution in northern Alaska.
The correlations above are based on phytostratigraphy constrained by marine biostratigraphy (many of the non-marine units interfinger with fossiliferous marine sediments) and some Ar/Ar dated bentonites. Other isotopic dating methodologies (e.g. U/Pb of detrital zircons) may improve the resolution.