Chap. VIII. PARRY'S THIRD VOYAGE. 275 



Professor Jameson, who also gives a few concluding 

 remarks on the geology of the four Arctic Expe- 

 ditions, a brief abstract is as follows : — 



1. That the regions explored abound in primi- 

 tive, transition, and secondary rocks ; partial allu- 

 vial deposits ; modern volcanic rocks not met with; 

 few traces of tertiary strata. 



2. That primitive and transition islands at one 

 time probably connected, and formed a mass with 

 the continent of America, in the plains and hollows 

 of which were deposited the secondary limestones, 

 sandstones, gypsum, and coal ; on these again the 

 tertiary rocks. 



3. 4, 5. Purely speculative. 



6. The boulders or rolled blocks afford evidence 

 of the passage of water across the places where 

 found. 



7. No traces of the agency of modern volcanos 

 any where except in Jan May en's Island. 



8. No intimations of older volcanic action, except 

 in the presence of secondary trap-rocks, such as 

 basalt, greenstone, trap-tufa, and amygdaloid. 



9. That black bituminous coal (the oldest forma- 

 tion) found in Melville Island and in Old Greenland, 

 forms an interesting feature in the geognostical 

 constitution of Arctic countries. 



10. That the red sandstone of Possession Bay, 

 &c, renders it probable that rock-salt may occur in 

 that quarter. 



t 2 



