MEMOIRS UNIV. CALIF., VOL. 1. NO. 2 



[MERRIAM1 PLATE 22 





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Pig. 1. A pool of asphalt which has come to the surface through a small pipe or channel. The tar has 

 mixed with the soil, so that its boundaries are not readily seen. 



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Pig. 2. A tar seep coming up through the soil where the ground has been largely occupied by grass and 

 weeds. Puddles and ponds of tar thus formed trap many small animals. 



