5318.) DN THE FORMATION OF tlOCkS. 5269 



SYNOPSIS OF THE ORIGIN OF ROCKS. 



As we do not comprehend either the creation, or anni^- 

 hilation, of matter^ by the origin of rocks we mean the 

 last change which produced their present form, and tlie 

 agents that nature employed to give them that form, or 

 leffectuate that change. 



First CiASSb Of Neptunian origin. 



Fi7'st Order, Formed by nature under our observa- 

 tion, visible, and resting on the evidence of our senses: 



Sand beds, Brown Coal, 



Gravel bedsj Bog Iron ore, 



Sea- Salt j Calcareous TufFa, 



Sandstone, Calcareous depositions^ 



Puddingstone", Silex from Hot-springs, &c*' 



Second Order , resembling, in structure^ position^ oV 

 component parts, the first order, die evidence of their 

 origin resting on direct and positive analogy: 



Coalj Graywacke Sc Graywacke slate, 



Gypsum, Transition Sandstone, 

 Chalk, ^ Transition Limestone, 



Compact Limestone, Transition Gypsum, 



Sandstone, Transition Clay Slate^ 



Puddingstone, Anthracite, 



Rock- Salt, Siliceous Shist* 

 Old Red Sandstone, 



Second Class. Volcanic origin. 



First Order. Thrown out of active volcanoes, anit 

 resting on die evidence of our senses; 

 Vol* I. T 



