BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 24, PP. 163-186 JUNE 6, 1913 



REPORT OF THE COMMITTEE ON THE NOMENCLATURE OF 



FAULTS x 



By Harry Fielding Beid, Chairman; William Morris Davis, 

 Andrew C. Lawson, F. L. Kansome, Committee 



{Presented before the Society December 28, 1912) 



CONTENTS 



Page 



Introduction 163 



General terms 165 



General classes of local movements on faults 167 



Translatory movements 168 



General discussion of terms 168 



Faults in stratified rocks 169 



Slip 170 



Shift 172 



Separation 173 



Throw and heave 175 



Apparent displacements 176 



Faults classified according to the direction of the movement 176 



Classes of strike faults 177 



Extension of the words "normal" and "reverse" to diagonal and dip 



faults 177 



Special classes of faults 178 



Rotatory movements 179 



Groups of faults 179 



Special terms 180 



Suggestions for teaching 181 



Introduction 



The great inconsistency in the use of terms relating to faults, and 

 especially the lack of uniformity when dealing with faults in which there 

 is a component of displacement parallel with the fault strike, 8 led to the 

 appointment by the Council of the Geological Society of America ;if the 

 Baltimore meeting, December, 1908, of a Committee on the Nomenclature 



1 Manuscript received by the Secretary <>t the Society March 20, 1918, 

 a ThIs was clearly shown by Mr. Ransome and by the discussion which followed bis 

 paper, "Economic Geology," vol. I, 1906, pp. 777 780; vol. U, 1907, potrfm. 

 XII— Bull. Geol. Soc. Am., Vol. 24, 1912 



