118 Armstrong: Glacial ee neces near Harrogate. 
which is the true eRe Bie ee ‘cov ering fhe idee Ol fue 
anticline. Very few erratics were encountered here, and those 
met with were of small size and chiefly locally derived. Where 
the old road has been widened, however, the drift is of a more 
sandy composition, and encloses an unusual number of erratics. 
Although the cutting at one point is ten feet in depth, the bed 
of blue clay has not been reached, so that all the boulders 
referred to were contained in the sandy yellow clay forming 
the upper bed of the drift. Over seventy of exceptional 
size have been removed, as well as cart-loads of smaller angular 
and sub-angular fragments. These boulders were jumbled 
together in characteristic confusion, the exposed sections 
presenting remarkable object lessons in the transporting power 
of land ice. 
The most interesting of the erratics is a giant slab of 
Plumpton Grit, 16’ 0” in length, which is the largest glacial- 
borne boulder recorded for tie district. This, as the illustra- 
tion indicates, is still embedded in the face of the cutting, 
although a parallel width of four feet was split off and removed 
when the excavation was made. Probably the slab extends 
for at least a similar distance into the hillside, in which case 
the original dimensions would be 16’ 0” « 8’ 0”. The thick- 
ness 1s 18” extreme, with 15” as a minimum, and the weight 
would be upwards of 12 tons. An outcrop of this grit, having 
beds of almost identical stratification, occurs about nine miles 
to the north-west, on the moor between Blubberhouses and 
Thornthwaite, from which place this slab was probably derived. 
Another large stone of the same description of grit was 
uncovered and measured 11’ 4” 9’ 0” x 2’ 10”, others measured 
8’ ODA Oo” x ie’ On 8’ 6” x ee Bo ad LO”, Ws Oe 4a 0” x eM Ou 
and several more were 6’ 0” and over in length, and of either 
Follifoot or Plumpton Grits, all being rectangular masses, and, 
like the largest ones, bearing evidence of transit in their 
rounded and battered edges and smoothed surfaces. None of 
the larger stones were striated, but three smaller ones, derived 
from the neighbourhood of Pateley Bridge, were well marked 
in this respect. Large numbers of boulders were of the class 
met with in the Pennypot Lane field, described and illustrated 
in ‘The Naturalist, 1909, page 243. Numerous angular 
fragments, 3’ 6” x 3’ 0” x I’ 0” on the average, had been obvious- 
ly derived from the beds of Follifoot Grit, which form such a 
prominent feature on the north side of this valley, at Long 
Crag, half a mile distant; whilst others had been torn from 
the beds of Kinderscout Grit, forming the face of the anticline 
against which this accumulation of boulders has been piled. 
At one point quite two loads.of typical Pateley Bridge flag- 
stones were discovered, ranging from an inch in thickness, up 
to large stones 2” thick, and 4 to 5 superficial feet in area. 
Naturalist, 
