﻿Belated 
  Sedimentary 
  Surface 
  Forms. 
  

  

  193 
  

  

  Fig. 
  7. 
  

  

  — 
  B 
  

  

  W 
  

  

  Fig. 
  7. 
  a-c, 
  diagrams 
  to 
  illustrate 
  the 
  influence 
  of 
  the 
  horizontal 
  com- 
  

   ponents 
  of 
  the 
  vortices 
  on 
  the 
  formation 
  of 
  interference-ripples, 
  a, 
  rectan- 
  

   gular 
  cross-ripples; 
  ~b, 
  hypothetic 
  form 
  of 
  rhombic 
  cross-ripples; 
  c, 
  hex- 
  

   agonal 
  cross-ripples. 
  

  

  A-A 
  — 
  the 
  first 
  set 
  of 
  ripples 
  formed; 
  B-B 
  — 
  the 
  second 
  set 
  of 
  ripples 
  

   (oscillation-ripples), 
  produced 
  later. 
  The 
  straight 
  arrows 
  at 
  the 
  top 
  give 
  

   the 
  direction 
  of 
  oscillation; 
  the 
  curved 
  arrows 
  indicate 
  the 
  horizontal 
  com- 
  

   ponents 
  of 
  the 
  vortices 
  in 
  the 
  lee 
  of 
  the 
  growing 
  second 
  set 
  of 
  ripples. 
  

   The 
  first 
  half 
  of 
  the 
  oscillation 
  is 
  represented 
  in 
  full 
  lines, 
  the 
  second 
  in 
  

   dashed 
  lines. 
  

  

  