Feb., 1892. 
PERMIAN BRECCIA OF LEICESTERSHIRE. 
31 
fine-grained, quartzo-felspathic rock or quartzose grit. These 
two specimens may possibly be connected with the Charn- 
wood series. (68.) A red, rather jasper-like rock, with some 
traces apparently of a rude cleavage. There has been con¬ 
siderable micro-mineralogical change, and so much infiltra¬ 
tion of red iron oxide, that it is very difficult to come to any 
conclusion. It might have been either an argillite or a 
volcanic glass, or possibly an altered specimen of one of the 
clay ironstones (see 86 and 73). 
IY.—Sedimentary Rocks of Uncertain Derivation. 
(54, 55.) Two fragments from Overseal, so far as can be 
seen, rather rectangular ; both of a pale reddish, somewhat 
green-spotted volcanic grit, but exhibiting some microscopic 
differences. The one (54) consists of broken quartz and 
felspar and of lapilli, which are all rather compact in struc¬ 
ture but various ; some of them are blackened with opacite ; 
one appears to have been more scoriaceous, the cavities being 
now filled with viridite. A few of the included fragments are 
rounded, the rest rather angular. The structure of several 
reminds me of the volcanic series in the north-western part 
of Cliarnwood Forest. The second specimen (55) has very 
little clastic quartz and felspar, consisting mainly of lapilli 
generally rather rounded, of which there are many varieties, 
one a very typical andesite; several of them more or less 
blackened with opacite. The former specimen bears rather 
more resemblance to a Charnwood rock than the latter, but 
it is not impossible both may have come from that senes. 
(56.) A fragment from Overseal, of a similar rock, containing 
a flattisli pebble quite an inch long. The angular shape of 
this specimen, with well-defined joint faces, indicates that it 
cannot have travelled far. It exhibits under the microscope 
a considerable amount of subangular quartz and of lapilli, 
probably water-worn. The latter have the same general 
character as those in the preceding specimens (54 and 55); 
some are of a very compact devitrified glass, some contain 
quartz grains, one exhibits “globules” of a greenish tint in 
a lighter matrix (with ferrite-staining occasional in both), 
perhaps connected with either a perlitic or incipient spheru- 
litic structure. The connection with the Charnwood series is 
not striking. (103.) A subangular fragment, from Overseal, 
of a reddish grit, containing rounded grains, both of lavas as 
in previous specimens, and of quartz, some compound; these 
in one or two cases suggest a derivation from quartzite, others 
possibly come from veins. (16.) A somewhat worn angular 
piece of a dull quartzose rhyolitic rock. Under the microscope 
it is seen to consist of (a) quartz in subangular grains. These 
