RICHARDSON : THE LOWER OOLITIC ROCKS OF YORKSHIRE. 201 
nieiit, occasionally coiitaiiiiiig crinoid -remains ; while in the 
Howardian Hills it is represented by a deposit that admits of dual 
division. The lower portion is subject to some variation, but is 
general! \- a well-bedded freestone and is known as the " Whitwell 
Oolite. " The u])per portion as a rule consists of sands and 
siliceous limestones (which often weather into roundish balls 
or doggers, or large tabular slabs) ; but in Cram Beck the lower 
part of this upper division is more argillaceous and from time to 
time has been worked for Fullers' Earth. 
Fox -Strang ways has given a lengthy list of fossils " from 
the Whitwell Oolite, or from the sandy beds associated -with the 
same," but unfortunately he does not say which are from the 
Oolite and which are from the sandy beds. Mr. Paris and I 
collected some very fair specimens of Spiropora straminea (Phillips) 
from the Wliitwell Oolite of the Mount-Pleasant quarries, near 
\^^itwell. and also numerous well-preserved examples of the 
curious gastropod-like serpula V ermicularia nodus Phil. Other 
fossils included portions of the tests of Pyqaster semisulcatus 
Phil., Galeolaria socialis (Goldf.). Acanthothyris sp., etc. 
On the eastern side of the Derwent Valley, around Westow, 
the Whitwell Oolite has been extensively quarried, and its outcrop 
is fairly regular from Leavening southwards until it is obscured 
by the overstep of the Cretacic rocks. 
In South-east Yorkshire the W^hitwell Oolite is called the *'Cave 
Oolite." It has been extensively A\'orked around Newbald and 
South Cave and crops out in the bed of the Humber giving rise 
to " Brough Scalp." 
With regard to the correlation of the Millepore Bed with its 
probable equivalent in Gloucestershire, its development on the 
coast at Cloughton at once reminds one of the Buckmani- and 
Lower Trigonia -Gritfi and also of the Pea-Grit. Spiropora 
occurs not uncommonlv in the Pea-Grit of the Cotteswolds ; 
abundantly in the Lower Trigonia- and Buckmani -Grits (especially 
in the latter) ; and, as the name implies, is the characteristic 
" millepore " of the Millepore Bed or of its equivalents inland — the 
Whitwell and Cave Oolites. 
The Cave Oolite is equivalent in part at least to the Lincoln- 
shire Limestone, certain of the component deposits of which are of 
