chap. xiv. Gypseous Formation. 507 



red, with, included layers brecciated and re-cemented. 

 Obscure marks of shell are distinguishable in it. 



4th. A red, quartzose, fine-grained conglomerate, 

 ■with grains of quartz, and with patches of white earthy- 

 feldspar, apparently due to some process of concretionary 

 crystalline action : this bed is more compact and 

 metamorphosed than any of the overlying conglome- 

 rates. 



5th. A whitish cherty limestone, with nodules of 

 blueish argillaceous limestone. 



6th. A white conglomerate, with many particles of 

 quartz, almost blending into the paste. 



7th. Highly siliceous, fine-grained white sand- 

 stone. 8th and 9th. Ked and white beds not ex- 

 amined. 



10th. Yellow, fine-grained, thinly stratified, mag- 

 nesian (judging from its slow dissolution in acids) lime- 

 stone : it includes some white quartz pebbles, and little 

 cavities, lined with calcareous spar, some retaining the 

 form of shells. 



11th. A bed between twenty and thirty feet thick, 

 quite conformable with the underlying ones, composed 

 of a hard basis, tinged lilac-gray porphyritic with 

 numerous crystals of whitish feldspar, with black mica 

 and little spots of soft ferruginous matter : evidently a 

 submarine lava. 



12th. Yellow magnesian limestone, as before, part- 

 stained purple. 



13th. A most singular rock; basis purplish gray, 

 obscurely crystalline, easily fusible into a dark green 

 glass, not hard, thickly speckled with crystals more or 

 less perfect of white carbonate of lime, of red hydrous 

 oxide of iron, of a white and transparent mineral like 

 analcime, and of a green opaque mineral like soap-stone ; 

 the basis is moreover amygdaloidal with many spherical 



