RICHARDSON : THE LOWER OOLITIC ROCKS OF YORKSHIRE. 193 
Counting the Cornbrash, there are five marine beds known 
in the Yorkshire Lower OoUtes. In descending order the}' are : 
(1) Cornbrash, 
(2) Scarborough Limestone, 
(3) Millepore Limestone, 
(4) EUer-Beck Bed, and 
(5) The Dogger, of which the most important layer 
is the Nerincea-Bed. 
(1) Cornbrash — Concerning this sub-division sufficient has 
already been said. 
(2) The Upper Estuarines. — The Upper Estuarines come 
between the Cornbrash and the Scarborough Beds, and in the 
district to the north of a line drawn westwards from Gristhorpe 
Bay comprise two divisions, namely : — 
'(1) Thin beds of sandstone or quartzite 
and shale resting on 
f (a) An upper, which (2) Extremeh' irrecularly-bedded sand- 
j comprises . . i stones, which are often replaced by 
Upper shale, with an occasional ironstone 
Estuarines I ' seam ; and 
! (6) A lower division, which is usually a well-defined massive 
bed of sandstone called the Moor Grit." 
Concerning the upper division there is little to say. Its 
beds are of much the same appearance over the whole of the 
Oolitic tract to the north of the line mentioned above, only in 
the district to the north of the Esk the deposits are hardened clays 
rather than shales, while in the neighbourhood of Danby Beacon, 
near the top, are some bands that are ver}^ similar to the " White 
Flint " to be noticed shortlv. 
As regards the Moor-Grit, it is not so readily-separated 
from the overlying sandstones where it first appears on the coast ; 
but it rapidly developes in prominence and importance to the 
north, and in the neighbourhood of Cloughton Wyke yields a very 
excellent building-stone and, at Smeaton, large flags. 
In the neighbourhood of Whitby and westwards over the 
district north of the Esk, the Moor-Grit is sometimes mainly 
represented by a hard wedge-bedded quartzite, which is locally 
called " White Flint," and has been extensively worked for road- 
metal, and at others, b}^ a sandstone excellent for building-purposes. 
On the Eston outlier, near Guisbrough, the Moor-Grit is 
