100 
The theory of the deposition of the boulder beds by river 
action is scarcely tenable. There is no evidence that the 
general contour of the land has been altered since the glacial 
age. This being granted, we cannot conceive it possible that 
rivers of so great width and extent could exist within 20 
miles of the water-shed. There is also the attrition the 
boulders have undergone; all traces of striae or angular 
corners being removed, which would hardly have been 
possible in the case of such large quantities as exist in the 
district ; even those found nearest the source of the stream 
presenting the same characteristics as those in the lower parts 
of the valley, — as witness the specimens collected by Dr. 
Alexander at Hebden Bridge. Another fact, which serves in 
some measure to support the theory that the boulders are an 
estuarine deposit, and have been washed into the Calder from 
the east, is the occurrence of fragments of chert, which have, 
in all probability, been derived from the chalk existing in 
the East Eiding. 
On the land being re-elevated there appears every 
probability that another very cold period existed, the country 
being again subject to glacial action, but to a much more 
limited or local extent than the preceding one. To this period 
may, perhaps, be attributed the beds of rounded boulders 
occurring at EUand Cemetery, Mytholm and Kirklees. 
They consist entirely of sand and boulders, derived from 
rocks existing in the immediate neighbourhood. I am 
bound to admit, however, that the subject still presents 
many diflSculties, which must be left for further research 
to solve. 
