84 
* 
decomposition of felspar. The quartz grains also possess oblong 
cavities, containing a liquid. When first he saw this bed Mr. 
WerHeEreD doubted its being “ Millstone Grit,” as the physical 
features were different from any which he had seen before, 
and very different from the same formation as exposed around 
Bristol. The matter was decided on a second visit to Drybrook, 
when he procured a “ Lepidodendron” from a quarry about half 
a mile off, opened on the same bed, which, however, was not 
capped by the beds which overlie it in the Morse section. A 
third visit to Drybrook left no doubt on the subject. He came 
across another quarry to the left of Euroclydon: at the top 
was the mottled Sandstone bed, and below that came a yellow 
Sandstone; below that came a yellow variegated Sandstone 
of a more compact structure, the grains of which were less 
rounded, and inclined rather to partake of the features referred 
to as characteristic of the grit from Bristol and around Sheffield. 
Passing from the “ Millstone Grit” in the Morse section, we 
find resting upon it a bed of rose-coloured Sandstone, eight 
inches thick, composed of well-rounded grains of quartz, avera- 
ging ‘050 of an inch in diameter, with decomposing felspar 
and mica. The dip of this bed is 15°; taking therefore the 
dip of the ‘‘ Millstone Grit” as 40°, we have decided unconform- 
ability. Upon the bed of rose-coloured Sandstone rests a bed 
composed of large quartzitic and trap rock pebbles; mixed 
with these are smaller fragments of quartz, which are however 
of a different character to the larger pebbles. Placed side by 
side with the veined quartz of the ‘‘Old Red Conglomerate,” it 
is difficult to distinguish one from the other. The large quartz 
pebbles seem to have been derived from the denudation of 
“Caradoc Sandstone” rock, similar to the beds described by 
Sir Roprerick Murcuison as occurring at the Lower Lickey 
Hills, in Worcestershire. Mr. Wernerep said that he was not 
aware of the occurrence in the Forest of Dean of another bed 
of pebbles similar to that at Morse. Had it been contempo- 
raneous with the ‘ Millstone Grit,’ it was not likely that it 
would be confined to the one locality of Drybrook ; it therefore 
appeared to him that we must either regard the ‘‘ Conglomerate,” 
a 
