COLE : CHALK" OF YOKKSHIEE. 27 
. . . -i) 
known to exist in nature, an(5^a^ fjpxthe formaJijpns ^ question, 
we must seek not for an artifici^cfe:^. ^atijj^ process of 
development. 
In conclusion, we wish to draw attention to certain remark- 
able needle-shaped structures, which occur all over the chalk area 
of Yorkshire, but not apparently in the South of England, and 
which are to be met with immediately below and above the thin 
layers of fuller's earth, alluded to above, as interfering- with the 
coherence of the chalk. They have been called slickensides " 
by men of repute, not intimately acquainted however, with the 
phenomena — but they are not slickensides ; and a thorough exam- 
ination will prove convincingly that some other explanation must 
be sought. Either they mark an incipient form of crystalization, 
or they are the remaining traces of some low form of animal life 
of the coral type, which was arrested in its growth by the muddy 
deposits of fuller's earth, and began its work again as soon as the 
water was once more clear. 
This is a question which deserves further attention in des- 
cribing the Chalk of Yorkshire. 
GLACIAL SECTIONS NEAE BEIDLINGTON. BY G. W. LAMPLUGH, 
PAET II. CLIFF SECTION EXTENDING 900 YAEDS SOUTH 
OF THE HAEBOUE. 
In pursuance of my plan of describing sections in this neigh- 
bourhood which are likely to be closed to the geologist, it is 
desirable that some account should be given of the cliff-section 
which lies immediately to the south of the Harbour at Bridling- 
ton Quay, as this is already partly hidden. I have therefore 
drawn to scale a section of the cliff for a distance of 900 yards 
from the South Pier, as is shown in the accompanying plate, and 
this I now supplement, as before, with a description and notes of 
some deductions I Dave drawn whilst at work on the section. 
