Akeival at Chachapoyas. 395 



ly of dark-brown slate, in which I found hosts of lias am- 

 monites. It is this range which divides the waters of the 

 Upper Maranon from the affluents of the Huallaga, and 

 which, meeting the more westerly sierra, forms the terri- 

 ble cataracts above the Pongo de Manseriche. 



Ascending and descending many a rocky staircase, and 

 winding through a deep and picturesque ravine beside the 

 rushing Ventilla, and between towering, treeless mount- 

 ains of red sandstone, the weary traveler suddenly and as 

 gratefully finds himself in the city of Chachapoyas. 



