:

  •  
                                                          

    () (Maas

    () (Maas

    Meuse), , . 925 , 36 . 2. . 300-400 3/. , , , . - , , .

    ( . 249-259)
    (Wegener) (1880-1930)
    - (1801-1826)

    -
    :