A new fossil Euspira? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska Author Powell, II, Charles L. Author Dineen, Ashley A. text PaleoBios 2023 2023-11-05 40 15 1 28 http://dx.doi.org/10.5070/p9401557134 journal article 305180 10.5070/P9401557134 94a5f11c-2370-4d05-987a-631635fab1a6 0031-0298 10913374

Table 1. Correction of Pliocene and Pleistocene marine transgressions of western and northern Alaska (after Marincovich and Powell, 1991).

Age (Hopkins 1965, 1967, Carter et al. 1986)	Bering Sea (Kaufman et al. 1989, Hopkins, written common., 1990 in Marincovich and Powell 1991)	Western and northern Alaska (Brouwers et al. 1984)	Skull Cliff (northwest Alaskan coast) (Brigham 1985, these units are all informal)	Arctic Coastal Plain (Carter et al. 1986)
<4 ka	Krusensternian	Flandrian	—	Flandrian
circa. 25 ka	—	—	—	Middle Wisconsin
90–105 ka	—	Flaxsman Fm.	—	Simpsonian
120–130 ka	Pelukian	Pelukian	Walakpa beds	Pelukian
circa. 500 ka	Anvilian	Kotzebuan	Karmuk beds	Wainwrightian
>1.5 Ma, <2.4 Ma	Beringian III	Fishcreekian	Tuapaktushak beds	Fishcreekian
>2.4 Ma	Beringian II	Anvilian	Killi Creek beds	Bigbendian
<3.5 Ma	Beringian I	Beringian	Nulavik beds	Colvillian