Mar., 1892. 
PERMIAN BRECCIA OF LEICESTERSHIRE. 
51 
markings. (59.) An exceedingly fine-grained qnartzose 
grit, or, possibly, a chert, with the impression of a crinoid stem, 
and one or two other organisms—doubtless Carboniferous. 
(46.) A piece of chert, consisting of a number of small 
silicified organisms, cemented together by cryptocrystalline 
quartz. Among the organisms can be distinguished a few 
small crinoid stems, and one or two chambered foraminifera. 
Fragments of shell can be recognised, with probability, but the 
majority, both from their smallness and from the effects of 
replacement, can be only conjecturally identified, and I cannot 
speak more positively in regard to sponge spicules. But that 
this is a piece of Carboniferous chert, I have no doubt. 
VI.— Large Boulders from Coton Park Colliery. 
At a depth of about 510 feet, in a trial shaft sunk beneath 
the village of Linton, near Burton-on-Trent, two large 
boulders, with some of smaller size, were found in the year 
1887, in a mass of Permian breccia lying on denuded coal 
measures. In the same deposit a fossil shell was found, 
which, however, has unfortunately been lost. The dip of the 
Permian at this place was to the west, about 1 in 4. One of 
the boulders was 8ft. 9in. x 3ft. lOin. x 2ft. 3in., weighing 
about a ton, much weatherworn in places; parts of the 
exterior were blotched and stained with red and purple, and 
on the flattest surface were five or six striae about 10 inches 
long. Here and there the matrix of the breccia adhered. 
This contained bits of hard red haematite (“ burnishing 
stones”). A little of the matrix also adhered to the other 
boulder, which measured 8ft. 3in. x 2ft. 9in. x 2ft. Part 
of its surface was well smoothed but not polished, and was 
marked with striae, some about 3 inches long. (Plate 2, 
Figs. I. and II.) 
The larger boulder (40) consists of a hard quartzo-felspa- 
thic grit, with a few flakes of mica. It might be a sandstone 
from the Carboniferous series, possibly from the Millstone 
Grit. It is a conglomerate, containing small pebbles (nature 
uncertain) in a reddish felspathic matrix. Under the micro¬ 
scope we find quartz grains in a rather iron-stained felspathic 
base, often converted into a microlithic micaceous mineral. 
Other fragments may be decomposed lava, some look more 
like a fine grained schist or phyllite. There are a few flakes 
of a colourless mica and one of brown mica. The second 
specimen (41) is a sandstone or felspathic grit, bearing, under 
the microscope, a close likeness to the last. Some bits of 
fine grained phyllite seem certainly present; two or three frag¬ 
ments of felspar, one resembling microcline, can be recognised, 
