appendix a: geological column. 



Development of Geological Column. 



679 



Maclure, 1817. (Wernerian.) 



Eaton, 1820. 



(la>s IV. Alluvial rooks... 



Class III. Floetz or secondary rocks. 



Class II. Transition rocks .. 



( lass 1. Intuitu : rocks . 



1. Peat. 



2. Sand and gravel. 



3. Loam. 



4. Bog iron ore. 



5. Nagel-fluh. 



6. Calc tuff. 



7. Calc sinter. 



12. Newest floetz trap 



formation. 



11. Independent coal 



formation. 



10. Floetz trap forma- 



tion, 

 y. chalk formation. 



5. Rock salt forma- 



tion. 



7. Third floetz sand- 



stone. 



6. Second floetz 



sandstone. 

 ">. Second floetz gyp- 

 suru. 



4. Second or varie- 



gated sandstone. 



3. First or oldest 



floetz gypsum. 



2. First or oldest 



floetz limestone. 

 1. Old Red Sand- 

 stone or tir^t 

 sandstone for- 

 mation. 



5. Transition 



sum. 



4. Transition 



slate. 



3. Graywacke. 



■J. Transition trap. 



1. Transition lime- 



stone. 

 14. White limestone. 



13. Primitivegypsum. 



12. Primitive flint. 



11. Quartz rock. 

 10. Topaz rock. 



9. Syenite. 



8. Porphyry. 



7. Serpentine. 



t). Primitive trap. 



5. Primitive 1 im e- 



stone. 



4. Clay slate. 

 3. Mica slate. 



2. Gneiss. 

 1. Granite. 



gvp- 

 flinty 



V. Alluvial class{£ Anujian. 



IV. Superincum-I 16 - Greenstone 

 bent class. ( 15 . B 3; 



114. Secondary 

 sandstone. 

 13. Gypsum. 

 12. Compact lime- 

 stone. 

 11. Breccia. 



Tra ns i t ion 

 class. 



I. Primitive 

 class. 



[10. Red sandstone. 

 9. Graywacke. 



8. Metalliferous 

 limestone. 

 [ 7. Argillite. 



6. Granular 

 limestone. 



r>. Talcose rock. 



4. Mica slate. 



3. Hornblende 

 rock. 



2. Gneiss. 



1. Granite. 



The position of the volcanic pro- 

 ductions was problematical, but it 

 was thought they might belong to 

 the superincumbent clas-;. 



