BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 4, pp. 133-H6 February 25, 1893 



SOME ELEMENTS OF LAND SOULITI'IJK 



BY LEWIS EZRA HICKS 



{Offered to the Society for Publication August 15, 1892) 



CONTENTS 



Pago 



Introduction l;;:; 



Relief Forme subject to fixed Laws 133 



Predominance of Curves, over Angles 134 



SI ructural Angles 134 



• Character of Hock governs Form 134 



Incessant Activity of sculpturing Forces 134 



Flatness characteristic of continental Blocks 134 



Weather Curve and water Curves 135 



Weather Curve 135 



Convexity of weather Curve 135 



Water Curves : horizontal and vertical 136 



Concavity of water Curve 136 



Combined weather Curve and water ( !urve 137 



Reversed Curves 138 



Gilbert's "Exception" explained 3 38 



Water Curve of Deposi t ion 142 



Alluvial Cone 142 



Flood-plains 142 



Cross-section of constructive River .... 14:; 



True Form of Cross-section 1 44 



Cross-section of River having no Flood-plain 144 



Anomalous Valleys of the great Plains L45 



Summary 14<> 



Introduction. 



Relief Forms subject to fixed Laws. — Every element of form which gives 

 character and expression ton landscape is determined by fixed Laws. It 

 is true that the arrangement of lulls and vales does not conform to any 

 simple geometric pattern. The sculpturing forces are complex, and the 

 net result of their interaction is necessarily also complex and promis- 



XX— Bull. Geol. Soc. Am., Vol. I. 1892. (!.'!:>) 



