VOLUME XXIII NUMBER i 



THE 



JOURNAL OF GEOLOGY 



JANUARY-FEBRUARY 1915 



THE ORIGIN OF THE INCLUSIONS IN DIKES 



SIDNEY POWERS 



Geological Museum, Cambridge, Massachusetts 



PART I 



Introduction 

 Examples 



Classified by the Movement of the Inclusions 



(A) All Inclusions Near Place of Origin 

 Cornwall, England 



Mexico 



Cape Ann, Massachusetts 



(B) Some Inclusions Have Sunk 

 Montreal, Canada 

 Marblehead, Massachussetts 

 Southern Sweden 



Cripple Creek, Colorado 

 Pequawket, New Hampshire 

 Lages, Brazil 



PART II 



(C) Many Inclusions Have Risen 

 Shelburne Point, Vermont 

 Mancos, Colorado 

 Aschaffenburg, Germany 

 Somerville, Massachusetts 

 Ogunquit, Maine 

 Rossland, British Columbia 

 Little Belt Mountains, Montana 

 Syracuse, New York 



Crazy Mountains, Montana 

 Beemersville, New Jersey 

 Summary 



Vol. XXIIl, No. I I 



