190 RICHARDSON : THE LOWER OOLITIC ROCKS OF YORKSHIRE, 
absent from Blea Wyke it follows that a marked non-sequence 
coincides with the line of separation — a state of affairs that was 
scarcely expected. 
In the generalized statement of the sequence of the component 
subdivisions of the Blea-Wyke Beds (Table II.) I have inserted 
all the information that is likely to be necessar}^ in view of the 
fact that detailed remarks on their correlation follow in the 
Appendix contributed by Mr. Buckman, and the significance of 
the non-sequence between the Lias and Oolites at Blea Wyke 
ma}^ now be considered. 
There is abundant evidence to show that in Yorkshire Liassic 
times were brought to a close by oscillatory movements of the 
sea-floor. The data at present available point to a general uplift 
in the north-west, incipient faulting in the neighbourhood of the 
present headland called " The Peak." and local furrowing by 
water of certain portions of the upraised Lias-floor. More detailed 
work may make it possible to show that certain anticlinal and 
sj^nclinal flexuring of the Liassic rocks took place before the 
deposition of the Oolites and was attended by the additional 
interesting expression of crust-movement — faulting. At all 
events, whatever precisely took place in closing Liassic times the 
earth-movements were not insignificant. They apparently were 
sufficient to uplift and to cause the erosion of the Lias in the 
north-western portion of East Yorkshire^ down as far as the Lower 
Lias ; to cause the channelling of the Upper Lias dowTi to within 
a few feet of the Jet Rock at the extreme southern end of Cold 
Moor in Raisdale ; and while these movements encouraged 
deposition on the depressed side of the Peak fault, they effected 
a very sporadic accumulation of sediment in certain other parts. 
Also, besides causing the inclusion of derived fossils in later beds, 
they interfered with the clear sequential entombment of the 
successive faunas and so have made careful collecting and the 
accurate discrimination of species doubly imperative if the true 
history of the Yorkshire Lower Oolites is to be pieced together. 
Such detailed work, however, is the province of local observers ; 
it must suffice here to state that the Nerincea-cingenda-^ed and 
its associated deposits, which constitute the Dogger proper, or 
I At Saltwick Bay derived ammonites "unmistakably Lower-Lias forms" occur between the 
Dogger and the Upper Lias. Mem. Geol. Surv., "Jurassic Rocks of Britain," Vol. I. (1892), 
" Yorkshire." p. 159. 
