VOLUME XXII NUMBER 6 



THE 



JOURNAL OF GEOLOGY 



SEPTEMBER-OCTOBER, 1914 



THE STRENGTH OF THE EARTH'S CRUST 



JOSEPH BARRELL 

 New Haven, Connecticut 



PART V. THE DEPTH OF MASSES PRODUCING GRAVITY 

 ANOMALIES AND DEFLECTION RESIDUALS 



SECTION B 



APPLICATIONS OF CRITERIA TO DETERMINE THE LIMITS OF DEPTH, 



FORM, AND MASS 



Depths Indicated by the Map of Deflection Residuals . . . 537 



General Relations Shown by Deflections 537 



Detailed Study of the Texas-Kansas Region 539 



Other Indications Regarding Depth of Outstanding Masses . 547 



Deflections Caused by Linear or Dike-like Masses .... 547 



Indeterminate Evidence from Anomaly Contours .... 548 



Relation of Depth of Outstanding Masses to Hypotheses Re- 

 garding Distribution of Compensation 551 



DEPTHS INDICATED BY THE MAP OF DEFLECTION RESIDUALS 



General relations shown hy deflections. — -Hay ford gives a plate^ 

 which shows all the residuals of Solution H. These are laid off as 

 arrows and show graphically the magnitude and direction of the 

 portions of the deflections which are outstanding after allowance 

 is made for the deflections calculated according to Solution H. 

 They therefore show the excesses or deficiencies of mass in the crust 



^Supplementary Paper, illustration No. 3; also Bowie, 1912, illustration No. 5. 

 Vol. XXII, No. 6 537 



M 



