22 Timothy S. Young and Joshua Laerm 



Family Megalonychidae 



Megalonyx jeffersonii (Desmarest) 



Jefferson's Ground Sloth 



Material — A single phalanx, UGAMNH2135, and tooth, 

 UGAMNH2136. 



Remarks — Jefferson's ground sloth occurred in woodlands where 

 it apparently fed on nuts, berries, leaves, and twigs (Stock 1925). It 

 is known from a number of sites in the Southeast including Florida 

 (Webb 1974a), Georgia (Ray 1967), South Carolina (Hay 1923, Roth 

 and Laerm 1980), and Tennessee (Guilday et al. 1969). It could have 

 tolerated a seasonally cool climate as evidenced by its 

 Pleistocene occurrence in what is now Canada and Alaska (McNab 

 1985). It is reported from Irvingtonian to Rancholabrean sites with a 

 terminal date of 13,890 years B.P., although Kurten and Anderson 

 (1980) suggest it may have survived even longer in Florida. 



Family Mylodontidae 



Glossotherium harlani (Owen) 



Harlan's Ground Sloth 



Material— Two teeth, UGAMNH2137-2138. 



Remarks — This was an open plains and grassland species (Stock 

 1925). It is reported from Irvingtonian to Rancholabrean sites with a 

 terminal date of 13,890 years B.P., although Kurten and Anderson 

 (1980) suggest it may have survived even longer in Florida. 



Order Primates 



Family Hominidae 



Homo sapiens Linnaeus 



Human 



Material — Cranial fragment, UF21280. 



Remarks — This single specimen was recovered by Gillette (19766). 

 Unfortunately, the cranial fragment was not available for examination. 

 We are, therefore, unable to comment on the degree of mineralization. 

 No other human remains were recovered in our efforts. The presence 

 of considerable amounts of Native American cultural material (pottery 

 shards) as well as 18-20th century European-American artifacts 

 indicates the St. Marks River was a site of human occupation before 

 and after European contact. 



