30 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 83 



From Triiiil to Ngavvi the steep banks of the Bengawaii or Solo river, for 

 an extent of y\ miles, consist exclusively of the above-mentioned volcanic sands 

 and lapilli, cemented into soft rocks, very much like the rocks which I saw in 

 the Siwalik hills. The strata have in this area a general dip S. of about 5°, and 

 are only concealed by a thin covering of vegetable soil. In these strata the 



"X ( At *^- 



j..^V I Piirrt^ o> 'fL,,V ^ ^\ ■^'^''^'■B^i■ 



Fig. 6. — Central part of Java, showing the Solo (Bengawan) River and the site 

 of the Pithecanthropus. 



Solo River has cut its channel 12 to 15 meters deep near Trinil. North and west 

 of Trinil the Pliocene marl and limestone appear under them.' 



It was near Trinil, in the left bank of the river, at the foot of the Kendeng, 

 that I came, in August, 1891, upon a place particularly rich in fossil bones, and 



.See also Dubois, Smithsonian Rep. for 1898, pp. 446-447. 



