^^"^ ZOOGENESIS M^ 



animals that lived during the Pleistocene or Ice Age 

 were caught like flies in sticky fly paper and slowly 

 sank beneath the surface. 



Animals struggling in the sticky mass served as bait 

 for beasts and birds of prey, and these in turn were 

 trapped and perished in great numbers. Water birds 

 were caught along the edges of the pools of water that 

 collected on the asphalt. 



More than three thousand giant wolves, two thou- 

 sand saber-toothed tigers, sixty giant ground sloths, 

 and mammoths, mastodons, lions, camels, tapirs, 

 short-faced bears, bison, peccaries, and many other 

 mammals, and a great variety of birds, already have 

 been dug out of this deposit. 



In a locality recently discovered in southern Arizona 

 mastodons were found which had been mired in boggy 

 mud holes about springs, just as they frequently were 

 mired in the peat bogs in the northern states. 



Dust blown by the wind sometimes kills and buries 

 animals, occasionally in great numbers. At a locality 

 in western Kansas the skeletons of nine peccaries or 

 American wild pigs were found huddled together 

 with their heads all pointing in the same direction. 

 Apparently they had been overtaken, killed and 

 buried by a sand storm. The wind blown dust de- 

 posits of the pampas of Argentina contain the remains 

 of many animals now extinct which seem to us most 

 fantastic and bizarre. 



Cave deposits have yielded many interesting fossils. 

 Some of these caves were the homes of beasts of prey 

 and the bones found in such caves are the bones both 



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