16 Classification of Rocks, 



L. Devonian. 



The Devonian or old Red Sandstone, constitutes numbers 30. Upper 

 Devonian, and 31. Lower Devonian of Sir Charles Lyell's Tables. These 

 formations are remarkable for the numbers of extraordinary fossil fish they 

 contain, and have been made celebrated by the works of Hugh Miller, the 

 leading geologist of Scotland. Occurs in Canada, Nova Scotia, and New 

 Brunswick. 



M. Silurian. 



32. Upper Silurian ; 33. Lower Silurian. — These two formations 

 constitute a large part of the fossiliferous surface of Canada, and Will 

 occupy much of our attention hereafter. 



N. Cambrian. 



34. Upper Cambrian ; 35. Lower Cambrian. — These are the lowest 

 and oldest rocks kno^vn to contain the remains of organized creatures ; they 

 are found m Britain, Bohemia, Sweden, the United States and Canada ; 

 they are of great thickness, but contain few organic remains. The copper- 

 producing rocks of Lakes Huron and Superior, called Huronian by Mr. 

 Logan, are supposed to belong to this formation. In Bohemia, where the 

 Palaeozoic rocks have been extensively and minutely examined by M. Bar- 

 rand, this part of the series has been named the Primordial zone. Sir 

 C. Lyell considers the Potsdam Sandstones of America to belong to the Cam- 

 brian rather than the Lower Silm-iau, to which latter division they have 

 hitherto been referred. 



In the following list the names of the formations which have their equi- 

 valents in this Province, are given in black letters, so as to shew at a glanco 

 ^svhat are present and what are absent in Canada : — 



ABRIDGED TABLE OF FOSSILIFEROUS ROCKS. 



7.— TERTIARY OR CAINOZOIC. 



i. RECEXT. 



2. POST-PLIOCENfe. 



3. NEWER PLIOCENE, 



4. OLDER PLIOCENE. 



5. MIOCENE. 



6. UPPER EOCENE. 



7. MIDDLE EOCENE. 



8. LOWER EOCENE. 



//.—SECONDARY OR MESOZOIC* 



9. MAESTRICHT BEDS. 



10. UPPER WHITE CHALK. 



11. LOWER WHITE CHALK; 



12. UPPER GREENSAND. 



13. GAULT. 



14. LOWER GREENSAND. 



15. WEALDEN. 



16. PURBECK BEDS. 



