312 Boioman — Geologic Relations of the Cuzco Remains. 



of inclination agree almost exactly with the characteristics of 

 the mass in which the bones were discovered. That a land- 

 slip of even large size should take place in such a manner as 

 to lead to equality of related features on opposite sides of a 

 ravine lies almost beyond the realm of possibilities. It is of 

 course possible that a break may exist of which there is no 

 surface indication, a break to be discovered only by extensive 

 excavation. Even in that event the explanation requires no 



Fig. 9. 



Fig. 9. South side of ravine of fig. 8. Complementary to fig. 4. The 

 channel on the left is common to both photographs. 



important modification. That the bones should be covered 

 with 75 to 150 feet of gravel in any position is the fact of out- 

 standing importance. 



The progressive deflection of the stream to the north as 

 shown in tigs. 4 and 8 has given the bluff a very steep 

 descent. Only a rather newly-made bluff in a dry climate 

 would be expected to retain for any length of time such a 

 sharp profile. The lower ten-foot section is almost vertical 

 (88°), a condition clue to artificial steepening in constructing 



