416 J. W. Powell—Types of Orographie Structure. 
Concomitant FoRss. 
1. Monoclinal Ridges on the Flanks.—Under conditions which 
are so well known as to need no further explanation here, mono- 
elinal ridges or hogbacks are formed on the flanks of such up- 
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R. W., Red Wall; U., Uinta. 
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Fig. 1.—Section through Junction Mountain, north and south. 
Fie. 2.—Section through Junction Mountain, east and west. 
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B, P., Brown's Park; 8. C., Sulphur Creek; J. T., Jura Trias; U. A., Upper Aubrey; L. A., Lower Aubrey; 
heavals, and sometimes such monoclinal ridges are of such 
b 
clinal ridges may be formed. 
