1897.] THE FOSSIL SLOTH AT BIG BONK CAVE, TKNX. i7 



Fig. 4.— Diagram showing a vertical section of the gallery in Big Bone cave where 

 the sloth bones were found. Layer i (2-3 inches), disturbed surface rubbish with 

 charred torch ends. Layer 2 (2 to 2^ feet), dry loose rat excrement, animal and 

 vegetable remains, etc., with sloth bones. Layer 3 (i foot), crusted lower portion of 

 rat excrement and vegetable remains formed before the advent of the sloth bones. 

 Layer 4 (of undetermined depth), loose pieces of nitrous clay, dry and hard, mixed 

 with manure. The disturbance resulting in the intrusion of torch ends and other 

 objects into the deposit as far as Layer 4, caused by burrowing rats, is seen against the 

 left cave wall. 



