276 



Geological 



Poems. 



rj Marble and the lower rocks contain no org^anic remains, but are the 

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

 \S4). — The Poet now proceedeth to relate the changes produced on the 

 crust of the globe by Ihe ag'ency of Pluto or subterranean fire. — Basal- 

 tic rocks frequently crystallized in columnar ranges, during their roa?oli- 

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

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

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

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

 liquified by fire. — In Anverg^ne and other districts there are porphyritic 

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

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

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

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

 muse desireth him to conclude. 



GEOLOGICAL ORDER OF SUCCESSION. 



I 



- -m 



Alluvial soil and gravel. 



Partial series of Strata over chalk. 



Chalk and Chalk Marie. 



Red and Green Sand. 



Various Oolites, &c. 



Lias Limestone aud Clay. 



ReJ Marie or Sandstone with Gypsum, 



Rock-salt and Magnrsian Limestone. 

 Sandstone, Shale, and Coal, 

 Great Limestone. 



Sandstone, Coarse Slate, and Grauwacc^,") 

 Various Slate rocks, containing beds of 

 Lower Limestone. 



Mica-slate, sometimes with white Lime- 

 stone and Serpentine. 

 Gneis?. 

 Granite 



The following rods frequently 

 occur trithout any regular order 

 of succession. 



Porphyry, Eurite, Sienite, 

 Greenstone or HornWende 

 rock, Se/^entinc. 



