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                                                     A



                                                  Land
                                                                        Distributaries
                            River                                                                    Lake
                                                                            Marshy delta surface
                                                                                 Topset beds


                                                                                      Foreset beds


                                                                                                 Bottomset beds




                           B
                       FIGURE 20.12  (A) Delta of Nooksack River, Washington. Note the sediment-laden water and how the land is being built outward by river
                       sedimentation. (B) Cross section showing how a small delta might form. Large deltas are more complicated than this.































                       FIGURE 20.13  Valley glacier on Mount Logan, Yukon Territory.

                       20-11                                                                 CHAPTER 20  Shaping Earth’s Surface   511
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