274 ODLING : CORRELATION OF THE UPPER AND MIDDLE OOLITES 
From my own field observations, extending over several years, at 
numerous points along the outcrop from Weymouth to Peterborough, 
I cannot help feeling that his views are fully upheld on purely strati - 
graphical considerations, and that the Cornbrash represents a period 
of great transgression, more often than not resting unconformably on 
the beds below. The classification is thus more readily brought into 
line with that of Continental geologists, who group the Cornbrash 
with the Kellaways under the general term of Callovien. 
Starting therefore with the Cornbrash as a datum line, it is the ob- 
ject of this paper to point out the sequence in various districts and their 
correlation, paying special attention to passage beds. 
In the neighbourhood of Weymouth there occurs in a comparatively 
small area a most complete sequence from the base of the Cornbrash 
into the Cretaceous. Here, also, the sequence is rendered very com- 
plete by the inclusion of numerous passage beds, so that this becomes 
a most suitable sequence with which to compare the beds in other areas. 
On the shores of " The Fleet," near Langton Herring, the Corn- 
brash rests on beds usually classed as Forest Marble, but which may, 
to a large extent at all events, include the Middle Fullonian — ^true 
Great Oolite being apparently absent. 
Succeeding the Cornbrash is a small thickness of sandy clay, the 
Kellaways Beds, which are best exposed at low water at Furzey Cliff 
(the " Ham Clif! " of old writers), just east of Weymouth. These form 
a complete transition from the Cornbrash into the purely argillaceous 
Oxford Clay above. 
Between the Oxford Clay and the Calcareous Grits there occurs 
a series of passage beds with an admixture of Corallian and Oxfordian 
forms. These passage beds, consisting of the No the Grits, with the 
Nothe Clay above, are best seen just west of Nothe Point, the promon- 
tory constituting the western side of Weymouth Harbour ; they also 
occur at the base of Benclif!, east of Furzey Cliff, but are here almost 
entirely hidden by the talus from the overlying Calcareous Grits, the 
Benclif! Grits. Ignoring the faulting, which is as a rule only slight, 
the south-easterly dip continually brings in newer beds, so that 
between Furzey ClifE and White Nab an almost complete sequence of 
Middle and Upper Oolites may be studied. 
