212 E. WETHERED ON THE LOWER CARBONIFEROUS 



of white and greenish-brown colour. Felspar was present in fairly 

 well-defined crystals. The quartz contained cavities similar to those 

 found in granite. The minerals occurred in clusters, and appeared to 

 have been derived from granitic rocks. The larger grains of quartz 

 averaged about *007 inch in diameter. 



No. 2. Colour light brown ; more compact than the last. 

 Same minerals present, but clusters less numerous. The grains, 

 as a whole, more waterworn, the larger ones averaging about 

 •008 inch in diameter. Calcareous fragments present. 



No. 3. From about the centre of the series. A calcareous 

 shale of light colour with a pale tinge of pink, very micaceous. 

 It gave the following chemical composition on analysis : — 



Silica 76-60 



Alumina 8'30 



Oxides of iron 2-13 



Lime 500 



Oxide of manganese -13 



Carbonic acid 5-00 



Magnesia 1*85 



Alkalies 1-12 



Loss on ignition < "35 



100-48 



"No. 4. Contained small "vein-stone" quartz pebbles, similar, 

 except in size, to those in the Old Red Conglomerate. Minerals 

 present the same as previously noticed. Quartz grains more water- 

 worn than before observed ; the larger ones averaged about -012 

 of an inch in diameter. It gave the following chemical composition 

 on analysis : — 



Silica 92-66 



Alumina 246 



Oxides of iron L13 



Lime -86 



Oxide of manganese -13 



Carbonic acid -45 



Magnesia trace. 



Alkalies 1-00 



Loss on ignition 1*20 



99-89 



No. 5. Colour yellow ; could not be distinguished, lithologi- 

 cally, from some beds of Millstone Grit in the neighbourhood, except 

 that the grains of quartz in the latter are more waterworn. Same 

 minerals present as before noticed, but a greater preponderance of 

 quartz ; the larger grains measured about '011 of an inch in 

 diameter. 



2. The beds to which I have just referred are succeeded by the 

 Lower Limestone Shales, the nature of which is shown in the 

 following section : — 



