ODLING : CORRELATION OF THE UPPER AND MIDDLE OOLITES 281 
between the Coraliian and the Kellaways is greater than anywhere 
else recorded in Yorkshire. This, however, is partly due to the high 
dip towards the fault near to which the borehole lies. 
We thus see that in Yorkshire we have two distinct types under one 
name. The Lower or true Kellaways is comparable with that of the 
South, and, together with the Cornbrash, is approximately equivalent 
to the Callovien of Continental geologists. The Upper, to which the 
term " Pseudo -Kellaways " may be given, is of more recent date and 
is only an arenaceous and ferruginous facies of Oxford Clay and some- 
times of even higher beds. 
The Coraliian calls for little special notice, the inclusion of an 
additional bed of calcareous gi'it and oolite (the Middle Calcareous 
Grits and Hambleton Oolite) above the Lower Calcareous Grits, 
appears to be peculiar to Yorkshire, whilst the Coraliian Oolite may be 
represented in the South by minor bands of marl and thin oolitic lim.e- 
stones. 
Of the Kimeridge Clay little is known. Forming as it does the 
floor of the Vale of Pickering, which is bounded to the north and south 
by fault scarps, it is almost entirely concealed by beds of glacial origin. 
In the neighbourhood of Speeton there occurs a remarkable 
series of argillaceous beds, the Speeton Clay, showing a complete 
transition from the Jurassic into the Gault. The interest specially 
centres in the zone of Belemnites lateralis, below which lies undoubted 
Kimeridge Clay and above which is undoubted Neocomian. This 
zone contains a mixed fauna, some of the forms being certainly 
Neocomian, while others are claimed as being of Portland and Purbeck 
age. By some, these latter are claimed to be derived, but Lamplugh 
and Pavlow* appear to consider them to belong strictly to the beds 
in which they are found. Whichever view is adopted, there appears 
to be no doubt that beds of Portlandian age were deposited either in 
this district or very near to it ; personally I should be inclined to 
consider them as an extreme form of passage beds. 
In Scotland, the only comparatively complete sequence is to be 
found on the east coast, in Sutherlandshire . The most noteworthy 
points are the apparent absence of Upper Coraliian and the admixture 
of Upper and Lower Kimeridge forms together with cycads, etc. 
* Quart. Journ. Geol. Soc, Vol. XLV., pp. 590 & 609 et eeq. 
