THE 



JOURNAL OF GEOLOGY 



JANUARY-FEBRUARY, 1894. 



THE DISTRIBUTION OF ANCIENT VOLCANIC ROCKS 



ALONG THE EASTERN BORDER OF 



NORTH AMERICA.^ 



CONTENTS. 



Introduction. 



Diversity of Opinion regarding Ancient Volcanic Rocks. 



Great Britain. 



Germany. 



Belgium and France. 



Scandinavia. 



Russia. 



America. 

 Criteria for the recognition of Ancient Volcanic Rocks. 

 Distribution of Volcanic Areas in Eastern North America. 



Eastern Canada (Newfoundland, Cape Breton, Nova Scotia, Gaspe, New 

 Brunswick, Eastern Townships). 



New England States (Maine, New Hampshire, Massachusetts). 



Middle Atlantic States (New York, Pennsylvania, Maryland, Virginia). 



Southern States (North Carolina, South Carolina, Georgia, Alabama). 

 General Conclusions. 



The great crystalline belt of the Eastern United States and 

 Canada, in spite of all the attention it has received, is probably 

 still the least understood geological province of our continent. 

 Here, almost more than anywhere else, personal adherence to 

 some preconceived theory of the origin and relationships of rocks 

 has biased observation and led to contradictory or unsatisfactory 



^ This paper was outlined at the International Geological Congress in Chicago, 

 August, i8g3, and read in full before the Geological Society of America at its Boston 

 Meeting, December 28, 1893. 

 Vol. II., No. i. i 



