65 
NOTES ON THE WHITE CHALK OF YORKSHIRE. 
BY G. W. LAMPLUGH, F.G.S., OF H.M. GEOLOGICAL SURVEY. 
Contents : 
Introduction ... ... ... ... p. 65. 
Part I. The Thickness of the Chalk ... p. 66. 
Part II. The Small Faults of the Chalk ... p. 77. 
Introduction. 
At the outset I may at once state that with regard to these 
notes, while I hope hereby to render available some fresh information 
respecting the White Chalk of Yorkshire, there will be no attempt on 
my part to deal adequately with the whole subject. My chief aim 
will be to supply details which may forward and lighten the labours 
of its future investigators. My knowledge of the deposit is the 
result of the somewhat desultory observations made during the leisure 
hours of the twenty busy years which I spent in the vicinity of 
Flamborough Head. 
I commenced to collect fossils from this grand range of cliffs 
while still a school boy, and am glad even yet to enjoy occasionally 
the keen relish of the collector on the di.scovery of a " good specimen " 
in these rocks. As time went on I began to realise that in spite of 
the past labours of Phillips, Barrois, Blake, and Mortimer, there 
remained the necessity for a vast amount of patient and somewhat 
tedious investigation before our knowledge of the Yorkshire Chalk 
could be placed on a really satisfactory basis ; and this led me to 
make measurements and records of some of the sections. Probably 
if I had remained much longer in the locality, and no other worker 
had come forward, I should eventually have taken the subject 
seriously in hand, and should have tried to submit the Upper and 
Middle Chalk to the same thorough study as Mr. W. Hill has 
accorded, with such excellent results, to the lower part of the 
formation. '''' 
* W. Hill, '* On the Lower Beds of the Upper Cretaceous Series in Lin- 
colnshire and Yorkshire. Quart. Jour. Geol. Soc, 1888, vol. xliv., p. 320. 
