276 



Geological Poems. 



ry Marble uiid the lower rocks contain no organic remains, but are the 

 repositories of metallic ores and various precious minerals (line 124 — 

 134). — The Poet now proceedeth to relate the changes produced on the 

 crust of the globe by the agency of Pluto or subterranean fire. — Basal- 

 tic rocks frequently crystallized in columnar ranges, during their consoli- 

 dation (line 147). — Greenstone and Eurite are described as beginning to 

 run or melt (line 151^. — Dark lavas and basalts appeared to have been 

 formed of the former, and whiter Lavas and Clink-stones of the latter — 

 Porphyry is with much reason believed in many instances to have been 

 liquified by fire. — In Auvergne and other districts there are porphyritic 

 rocks which appear to have been softened by heat, and again consoli- 

 dated in their original position, or in situ, without ever having flowed as 

 lava (line 156). — The Poet referreth to the conflict of the two contend- 

 ing elements when these great changes were taking place, and then his 

 muse desireth him to conclude. 



GEOLOGICAL ORDER OF SUCCESSION. 



Alluvial soil and gravel. 



Partial series of Strata over chalk. 



Chalk and Chalk Marie. 



Red and Green Sand. 



Various Oolites, &c. 



Lias Limestone and Clay. 



Red Marie or Sandstone with Gypsum, 



Rock-salt and Magnesian Limestone. ( 

 Sandstone, Shale, and Coal. | 



Great Limestone. ] 



Sandstone, Coarse Slate, and Grauwacce,^ 

 Various Slate rocks, containing beds of j 



Lower Limestone. 

 Mica-slate, sometimes with white Lime 



stone and Serpentine. 

 Gneiss. 

 Granite. 



The follotving rocks frequenlly 

 occur without any regular order 

 of succession. 



Basalt 

 Lava. 



I Porphyry, Eurite, Sienite. 

 K. Greenstone or Hornblende 

 rock, Serpentine. 



