28 



and fifty miles, thus forming, perhaps, the 

 most extensive geological section hitherto 

 made from personal examination. One of 

 the most singular facts announced in this 

 work, is the existence of an uninterrupted 

 stratum or layer, of argillaceous iron ore, 

 extending from the Little Falls beyond Ni- 

 agara, a distance of more than two hundred 

 miles. This bed is from twenty to thirty 

 miles broad, and about two feet thick. 



Mr. Eaton has essayed in this work, to 

 introduce a new nomenclature of rocks, but 

 with what success must be left for future 

 naturalists to decide. The very limited 

 and narrow formations to which names have 

 been applied in Europe, induced the author 

 to substitute more appropriate and better 

 defined names in their stead. Thus the se- 

 condary graywacke is called calciferous 

 slate ; swinestone, geodiferous rock, &c. &c. 

 If, as most geologists admit, new names 

 should be introduced to designate rocks 

 which constitute such extensive formations, 

 the propriety of the course adopted by Mr. 

 Eaton cannot be questioned. Under all 

 circumstances, no writer can justly be ac- 

 cused of too much boldness in proposing 



