314 



Messrs. Buckland's and Conyeeare's Observations on the 



be disposed in the interior of the earth, which, though defaced by the absurd 

 hypothesis of each stratum being continued to the very centre of the globe, 

 yet is important as indicative of his behef in the constancy of the regular 

 arrangement of mineral masses. The following is that arrangement, such as 

 he believed it to exist ; and if we apply to it those explanations that his own 

 memoir appears to warrant, we shall find in each of his formations a singularly 

 close approximation to the truth. Of the 12th number of the series, denomi- 

 nated iron, the context does not suggest any obvious interpretation. 



Series of Beds in the Order of Superposition, 



Interpretation of the Terms used by Mr. Strachey, such as his Menjoir 



according to Mr. Strachey, 1719. 



appears to warrant. 



1. Chalk 



Chalk. 



2. Freestone 



Bath oolite. 



3. Lias limestonei 





4. Marl ^ . . . . 



Lias formation. 



5. Yellow earth "i 





6. Red earth and ochre j 



Newer red sandstone. 



7. Coal dives i 





8. Coal > 



Coal-measures. 



9. Lead 



Mountain limestone, containing veins of lead ore. 



10. Copper 



Slate, containing veins of copper ore. 



11. Tin 



Granite and other primitive rocks, containing veins of tin. 



12. Iron 



J 







APPENDIX II. 

 On Red Sandstone. 



In the south-western coal-district of England we have three formations of 

 red sandstone, the newer red sandstone, the millstone grit, and the old red sand- 

 stone, all liable to be confounded with one another owing to their prevailing red 

 colour, and to their containing beds of conglomerate ; and as similar rocks 

 occur, very similarly placed, in various parts of the earth's surface, we find 

 three opinions maintained concerning red sandstone, and each moreover sup- 

 ported by indisputable facts : one, that it lies over the coal-measures ; another, 

 that it lies beneath them ; and a third, that it is a member of the coal- 

 formation. 



The term old red sandstone was originally applied by Werner to a forma- 

 tion analogous in character and geological position to our newer red sandstone. 



