STATHER : BELEMNITES OF THE YORKSHIRE CHALK. 247 
On examining the Yorkshire Chalk, Dr. Rowe^ was able to 
show that, from such specimens as he had been able to collect, 
the observations of M. Grossou\Te and himself, in France and 
Dorset respectively, were confirmed. In Yorkshire, however, 
there was by no means the complete series available that existed 
in the South, and he admitted that, so far as his observations 
went, he had not been able to find a single unquestionable Act. 
quadratus, nor of Act. westphalicus , in the county. Notwith- 
standing his admittedly careful and detailed examination of the 
Yorkshire Beds, he was only able to obtain specimens from the 
middle of the series. So far as these went, however, they con- 
formed with the general changes already mentioned ; namely, 
that in the lower beds the specimens approached westphalicus, 
in the middle beds they were distinctly of the granulatus type, 
and in the upper beds they approached quadratus. 
On page 271 of his Yorkshire paper he gives a number of 
diagrams of Belemnites collected from the base of the Micraster 
cor anguinum zone at High Stacks ; the lowest in his series ; to 
the quadratus zone at Ruston Parva, which was the highest 
example that he obtained. The series as set out in his sketch 
certainly indicates that the alveolar cavity gradually deepens as 
specimens are obtained in ascending order, thus confirming 
M. Grossouvre's observations. 
In 1894, Mr. G. W. Lamplugh contributed a valuable paper 
to these Proceedings on the Yorkshire Chalk, Part 1.^ In this he 
gave measurements of every individual bed that occurs in the 
cliff section between Sewerby and High Stacks, which total 
550 feet ; together with lithological particulars of the beds, and 
with sundry details as to their fossil contents. Upon this paper 
I have formed the basis of my own field work in the district ; and 
on my visits to the sections I have supplemented particulars of 
the various fossils, etc., found, being careful to add each indi\ddual 
record to the particular bed in which it occurs. 
In addition to the 550 feet of fhntless chalk on the coast, 
Mr. Lamplugh estimates that there are at least 100 feet of Upper 
Chalk inland which may be examined here and there in quarry- 
sections. 
My own observations tend to confirm Mr. Lamplugh's esti- 
mate, and, if anything, my impression is that he has under- 
1 Proc. Geol. Assoc., Vol. XVI II., Pt. 4, 1904. 
2 Proc. Yorks. Geol. Soc, Vol. XIII., Pt. 1. 
