140 W. H. HOBBS REPEATING PATTERNS IN STRUCTURE OF LAND 



works in northwestern Europe are described and explained by joint con- 

 trol.^* At about the same time Kjerulf^^ brought out identical facts for 

 Norway. A less familiar example from the same early period, but from 

 an American district, was described by Alexander Winchell, though the 

 explanation which he offered (formation strike combined with glacia- 

 tion) seems almost fantastic in view of the known facts.^® 



MERGING OF NETWORK PATTERNS 



The cases which have been cited as examples of repeating relief pat- 

 terns show how a simple diaper-like design is many times repeated within 



g£RI 



Figure 17. — Map of the Vicinity of Bergen, Norway 

 Showing the merging of different relief patterns 



any given district. Such repetition does not, however, go on indefinitely. 

 With rather remarkable abruptness such patterns disappear or give place 

 to others of a slightly different character, but generally merely differently 

 oriented. This may be illustrated by portions of the map of Norway. 

 Thus the area about the Moldef jord reveals a regular rectangular pattern 

 near the Fannef jord and Langf jord, which is not of identical orientation 

 with that to the east of the Eresfjord and the Eikesdalsviken (see figure 

 16). Again, the vicinity of Bergen, may be used to illustrate such an 

 abrupt change of pattern in the relief. Here about the Osterfjord a 



" Daubree : G^ologie Experimentale, Paris, 1879, pi. iii, figs. 1-2. 

 "Kjerulf: Loc. cit, pp. 328-334. 



lo A. Winchell : The diagonal system in the physical features of Michigan. 

 Journal of Science (3), vol. 6, 1873, pp. 36-40. 



American 



