HUGHES : IXGLEBOROUGH. 
325 
The rock consists, as far as the finer parts are concerned, of 
fine felspathic dust ; the grit is composed chiefly of grains of quartz 
and pink orthoclase in a greenish matrix consisting of finer grit 
and the same material as the slate. There are also, but rarely, 
beds of breccia much like those in the Borrowdale Series. Iron 
pyrites occurs in beautifully perfect cubes, and as dendrites in 
the slates, while the iron pervades the whole as a green silicate 
which is especially conspicuous in some of the more crystalline 
quartz veins. 
No fossil has ever been found in their equivalents in Cumber- 
land ; and, though these Yorkshire beds are more promising than 
those of. the Lake District, no fossil has yet been recorded from 
them. The black marks seen on some faces of rock in the slate 
quarry north of Ingleton, which by their outline suggested grapto- 
lites, are merely segregations of mineral matter ; while in other 
cases the combination of concretions and rock crushing have 
produced complex arrangements in which imagination has seen 
traces of trilobites and other organisms. 
The succession as observed or inferred is shown in Section, 
Fig. 9. The coarser beds, known as "calliard," indicate the 
direction of the dip, an I show, as pointed out by Professor 
Sedgwick,'"'^ that in the slate quarries " the planes of fission are 
parallel to the original laminae of deposit." But in the absence 
of such bands it would be very difiicult to make out the bedding. 
The apparent dips are generally high, from 70° to 90°, some, how- 
ever, being as low as 50°. The strike is always N.W. and S.E. 
The series would appear at first to have a fairly uniform 
dip to the S.W., the general differences of material showing a 
succession in that direction, and the details of the stratification 
at the S.W. end of the section where they can be made out 
indicating a coincidence of bedding and cleavage at about 80° to 
the S.W. (see Section, Fig. 9). Where, however, marked beds, 
such as the grits and conglomerate of Dale Barn and those recently 
exposed in the so-called granite quarry on the opposite side of the 
* Quart. Journ. Geol. Soc, Vol. VIII., p. 45. 
