PLEISTOCENE ECOLOGY AND BIOGEOGRAPHY 



399 



o All dates have been published in Science. Initials indicate the laboratory: L, Lamont; 

 C, Chicago; M, Michigan; W, Washington; Y, Yale; A, Arizona. 



* Organic material from muck of deposits that fill valleys of minor streams, "... under- 

 lain by blue-gray silt or by an older muck that contains fossil remains such as elephant, 

 horse, and bison, which are conspicuously absent in the dated muck. 



" Equus excelsus, Camelops sp., Sangamona sp., Asinus conversidens, Euceratherium 

 collinum, Preptoceras sinclairi, Stockoceros onusrosagris, Bison antiquus, and Rangifer? 

 fricki. 



'' "Material from this site should date the age of the extinct Giant Bear." 



* Charcoal from newly exposed canal. "Associated with extinct Seminole Field mam- 

 mals, an archaic spear point, ilint chips and burned bone." 



•^ Tusk fragments of this mastodon yielded a much older date, M-139, 12, 630 ±1000 

 years {Science, 127: 1099). 



