01544nas a2200157   4500008004100000245005900041210005700100300000900157490000600166520106400172100001501236700002001251700001501271700001901286856008101305       2019                        eng d00aA New AMS Radiocarbon Date for the Ivory Pond Mastodon0 aNew AMS Radiocarbon Date for the Ivory Pond Mastodon  a1-150 v33 a<p>The Ivory Pond Mastodon (Mammut americanum) was found in South Egremont, Massachusetts, in 1982. A recent AMS radiocarbon assay on bone collagen yielded an age of 11,885 ± 30 rcbp (UCIAMS 193953), which currently calibrates to 13,580–13,770 cal BP. This date is<br />
statistically similar to a much more imprecise date (GX9024-G; 11,440 ± 655 rcbp; 11,500–15,290 cal BP) previously obtained from the specimen. This age is similar to those of other American Mastodon specimens; collectively, these dates imply prior expansion of boreal forest (mastodon habitat) into the region ca. 14,600 cal BP. The location of this specimen east of the Hudson River implies that Late Glacial proglacial lakes that occupied the Hudson River Valley in the past were not a hindrance to megafaunal colonization of New England. The chronology and depositional contexts of this and other mastodon specimens in the region necessitate that human predation be considered as a possible cause of the extinction of this and other megafaunal species in the northeast US.</p>
1 aFiedel, S.1 aFeranec, R., S.1 aMarino, T.1 aDriver, D., B.  uhttps://www.eaglehill.us/epalonline/access-pages/003-Fiedel-accesspage.shtml