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accumulated aggrading American Naturalist assemblages basins Basket Makers bed-rock bison bones Buda Buda limestone Burnet Cave Camelops clay Clovis coarse rock Coffin Colorado containing artifacts correlation Dawes County early Ernst Antevs eroded erosion evidence extinct animals faunas feet of varved flood plains Folsom points fossil FRANK H. H. ROBERTS geochronologies Geol geological glaciation gravel stratum human remains implements J. E. Todd known large rocks late-glacial late-Quaternary Lindenmeier Site living locality loess mammals material Mexico mile east Missouri mollusks Museum Nebraska northern Nothrotherium occur Pleistocene pluvial lakes post-glacial present stream level Pupilla Quaternary rainfall recent region rock and gravel rock bars Round Rock Sand Creek sequence silt slackwater beds soil zone South Dakota SOUTHWESTERN spearpoints stages Sterki stratum subfossil SUCCESSION OF MAMMALIAN summer layers temperature terrace deposits Tetrameryx tion to-day trench types varved sediments White River Valley winter layers Wisconsin glaciation