In 1933, Serbelodon burnhami (now Amebelodon burnhami) was discovered and named after the celebrated scout Frederick Russell Burnham.
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The plant microfossil analysis recovered fragments of conifer tracheid and vessel elements with a ray of parenchyma cells, which corroborates the consumption of wood plants, pollen grains, spores, and fibers.
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Isotopic analyses for South American gomphotheres suggest a wide dietary for N. platensis except for the localities in Santiago del Estero and La Carolina in Ecuador.
:In Sonora, field work in collaboration with M.G.Sanchez (INAH) focused on a series of Clovis sites, most prominently an in-situ Clovis/Gomphothere kill site and an extensive camping area on the adjacent uplands.