BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 24, pp. 187-216 June 6, 1913 



NOMENCLATURE OF SURFACE FORMS OX FAULTED 

 STRUCTURES x 



BY W. M.. DAVIS 



{Presented in abstract before the Society December 28, 1912) 



CONTENTS 



Page 



Geological and physiographical nomenclature of faults 187 



The cycle of erosion 188 



Interruptions of the cycle of erosion 189 



Relation of faults to the cycle of erosion 190 



An ideal series of forms on faulted structures 191 



Initial and young forms on faulted structures 192 



The essential principle in the physiographic description of faults 195 



Examples of initial and young fault scarps . 196 



Mature forms on faulted structures 197 



Physiographic evidence of faulting 198 



Examples of maturely dissected fault scarps 200 



Ohsequent ravine heads 202 



Subsequent fault-line valleys 202 



Obsequent fault-line scarps ; 203 



Old forms on faulted structures 203 



Transverse faults in monoclinal structures 204 



Second-cycle forms on faulted structures 205 



Examples of second-cycle forms on faulted structures 209 



An imaginary example 211 



Forms produced on faulted structures by other than normal processes .... 213 



Definitions of terms used in describing forms on faulted structures 214 



References 215 



Geological and physiographical Nomenclature of Faults 



The geological nomenclature of faults is chiefly concerned with a geo- 

 metrical treatment of local problems of underground structures, and 

 gives little or no consideration to surface forms. The physiographic 

 nomenclature of faults is concerned almost wholly with large topo- 



1 Manuscript received by the Secretary of the Society April 28, 1918. 

 Presented orally in abstract December 28, 1912, as :i discussion of tin> report of cue 

 Committee on Nomenclature of Faults. 



XIV— Bull. Gbol. Soc. Am., Vol. 24, 1912 ( 187) 



