﻿II. 
  E. 
  Gregory 
  — 
  Gravels 
  at 
  Cuzco. 
  

   Fig. 
  3. 
  Fig. 
  4. 
  

  

  19 
  

  

  

  4. 
  

  

  a, 
  soil 
  and 
  debris. 
  

  

  b, 
  4 
  ft., 
  adobe 
  with 
  lenses 
  and 
  stringers 
  

  

  of 
  gravel. 
  

  

  c, 
  10 
  ft., 
  coarse 
  gravel 
  with 
  masses 
  of 
  

  

  adobe. 
  

  

  d, 
  4 
  ft., 
  sand 
  with 
  thin-gravel 
  beds 
  in 
  

  

  upper 
  part. 
  

  

  a, 
  14 
  ft., 
  horizontally 
  bedded 
  sand 
  with 
  

  

  slight 
  cross-bedding. 
  

   6, 
  4 
  ft., 
  gravel 
  and 
  sand 
  interbedded. 
  

  

  c, 
  % 
  ft., 
  fine 
  sand 
  cemented. 
  

  

  d, 
  lj^ft., 
  gravel 
  and 
  sand 
  interbedded. 
  

  

  e, 
  fine 
  sand 
  cemented. 
  

   /, 
  sand 
  with 
  stringers 
  of 
  gravel. 
  

   g, 
  coarse 
  gravel. 
  

   h, 
  5 
  ft., 
  sand 
  with 
  two 
  clay 
  lenses. 
  

  

  Fig. 
  3. 
  Section 
  II. 
  west 
  bank 
  of 
  Ayahuaycco 
  Quebrada 
  at 
  month 
  of 
  

   canyon 
  portion 
  of 
  valley. 
  Dip 
  S. 
  W. 
  Z 
  2°. 
  

  

  Fig. 
  4. 
  Section 
  III. 
  Ayahnaycco 
  Qnebrada, 
  200 
  feet 
  from 
  month. 
  Note 
  

   absence 
  of 
  gradation 
  between 
  strata. 
  Bowlders 
  six 
  to 
  eight 
  inches 
  in 
  diam- 
  

   eter 
  rest 
  directly 
  npon 
  the 
  smoothed 
  surface 
  of 
  adobe. 
  Gravels 
  traverse 
  

   adobe 
  masses 
  vertically 
  and 
  horizontally. 
  

  

  