98 RASTALL : THE INGLETONIAN SERIES OF W. YORKSHIRE. 
A few rounded fragments, consisting of calcite with twin- 
striations, are probably recrystallised limestone, but it is not 
possible to be certain that they are not due to secondary calcite 
deposited in small cavities. 
It would be easy to extend this list indefinitely, but enough 
has already been said to indicate the general character of the 
larger fragments composing this interesting rock. The smaller 
elements consist for the most part of more or less angular chips 
of quartz and felspars of several varieties, orthoclase, perthite, 
microcline, albite, and oligoclase. 
Chlorite also is extremely abundant. It is mostly of a 
somewhat bright green colour, only slightly pleochroic and usually 
isotropic ; some sections, however, having a similar appearance 
in ordinary light, give the interference tints of the mica group, 
and must be regarded as green biotite. Broadly speaking, the 
strongly birefringent green mineral seems to be detrital, while 
the isotropic or weakly birefringent variety is of secondary 
origin. 
The Conglomerate of Row End, Horton. 
At the sharp bend of the Ribble at Row End, close to Horton 
Station, occurs a thin bed of a rather coarser type of sediment 
than is usual in this valley. Although this is the lowest or 
rather the most northerly bed actually seen in this district, 
there is nothing to show that it is the base of the series. The 
outcrop of the Ingletonian rocks must extend for at least a 
quarter of a mile further up the stream, but owing to drift there 
are no exposures. It is more probable that this is an attenuated 
representative of the thick conglomerate of the Ingleton Granite 
Quarry. It occurs in about the position where this would be 
expected, and its petrographical characters are not dissimilar. 
It is a rock of a general greenish-grey tint, containing 
pebbles up to half an inch in diameter, embedded in a fine- 
grained matrix, and the whole has a distinctly sheared and slicken- 
sided appearance. Omng to this crushing its original character 
is rather difficult to make out, but it is certainly not purely a 
crush-conglomerate, since it contains weU-rounded pebbles of 
grit, quartzite, gneiss, granulite, quartz-porphyry, schist, slate. 
