506 Hutton — Classification of Roch. 



my only hope is that I may have suggested the way in which some 

 order may be introduced into a subject which is at present, as I 

 imagine, in a great state of confusion. 



Class 



Division 



Group 



Kind 



1. Conflated 



2. Ejected .. 



3. Tufaceous < 



4. Chemico- 

 organic... 



Acidic 



Acidic. 



Basic 



r Calcareous... 



5. Detrital...* 



6. Funda- f 

 mental ...■{ 



I 



L 



7. Migrated 



Acidic 



Basic 



P.i 



M. 



Blown Sand. 



Pumice-tuff; Trachyte-tuff. 

 Basalt-tuff. 



Pumice-tufa, Trachyte -tufa, Trachyte- 

 breccia, and Agglomerate. 



Felsite-tufa. 



Some Felstones, and Clay-stones. Tra- 

 chyte Porphyry. 



Dolerite-tufa ; Basalt-breccia and Ag- 

 glomerate. 



Greenstone-ash, Palagonife-tufa. 



Diorite Sandstone and Slate, Aphanite 

 Slate, Schalstein. 



Earthy Limestone, Chalk, Magnesian 

 Limestone, Gypsum, Rock Salt. 



Compact Limestone, Dolomite, Anhy- 

 drite. 



Granular Limestone. Ophicalcite or 

 Verde -antique. 



Diatomaceous Earth. 



Tripoh. 



Some Hornstones and Lydianstones. 



Peat, Lignite. 



Cannel Coal, Coal. 



Anthracite, Graphite. 



Bog-iron ore. 



Brown Hydrated Hematite (some). 



Bed Hematite (some). 



Sandstone, Gritstone. 



Quartzite. 



Jasper-rock, Itacolumite, Novaculite. 



Gravels and Boulder-beds, etc. 



Conglomerates and Breccias. 



Some Porphyries. 



Clay, Shale, Marls. 



Clay-slate, Clay-rock. 



Argillite or Phyllite, some Hornstones. 



Gneiss, Mica-schist, Quartz-schist, Gra- 

 nulite, Schorl-rock. 



Granite, Greissen. 



Hornblende-schist, Chlorite-schist, Talc- 

 schist, Eklogite. 



Syenite, Minette, some Serpentines. 



Felstone, Quartz-porphyry, Pitchstone, 

 Eurite, Elvanite. 



Rhyolite, Trachyte, Phonolite, Andesite, 

 Perlite. 



Diorite, Aphanite, Diabase, Gabbro, 

 Lherzolite, Melaphyre, Opiolite (Ser- 

 pentine) . 



Dolerite, Basalt, Anamesite. 



' P, =Protomorpliic. ^ jj. =Hemimetamorphic. ^ -^^ . 

 ^ Mas. = Massive. * T. = Trappean. 



:Metamorphic. 

 V. = Volcanic. 



*S. = Schistose. 



