HORIZONTAL MOVEMENT OF GEANTICLINES 577 
demonstrated by Argand.t. Here likewise we see that in Mesozoic 
time geanticlines formed, separated by geosynclines, and that these 
have been moved in a horizontal direction. It may be that the 
southeastern Indian Archipelago will in the future arrive at the 
same stage as was long before reached in the Alps. As the hori- 
zontal movements proceed, the sea basins will narrow, and even- 
tually the masses of the deeper parts of the present rows of islands 
will be pushed over the present Australian continent and the Sahul 
shelf which extends its borders. For a judgment, whether the 
active force tending to produce movement is directed to the south- 
east or to the northwest, as would follow from the conceptions of 
Hobbs? and Wegener,’ no sufficient data are available. 
tE. Argand, “Sur l’arc des Alpes occidencales,” Eclogae Geol. Helv., Vol. XIV 
(1916), p. 179. . 
2W. H. Hobbs, op. cit., p. 91. 
3 A. Wegener, “‘Die Entstehung der Kontinente und Ozeane,”’ Die Wissenschaft, 
1920. 
