8 THE MOORLAND DISTRICT. 
The dogger series, (No. 14,) which immediately covers the lias, 
is a group of sandstone rocks very variable in appearance and composition. 
Where fully developed, as on the sea-coast at Blue Wick, under the 
High Peak, it presents a considerable thickness of subcalcareous irony 
sandstone, with several layers of shells and pebbles, of which the lower 
part assimilates very decidedly to the lias beneath. In consequence of 
this assimilation, we may conclude* that both formations are here com- 
plete In the sea cliffs farther west, the dogger series is not known to 
contain any shells, nor does it generally exhibit any such gradation in 
character to the lias beneath. Some parts of the stratum, therefore, are 
in such cases, wanting. Shells of the same kinds are those which fill the 
dodger at Blue Wick, are again found in it at the fine cascade, a few 
miles from Whitby, called Falling-force ; in the upper part of Goadland 
Dale, and at Coldmoor, and other places in the Cleveland hills.f Com- 
monly about Whitby and Robin Hood’s Bay, its lower layers contain 
nodular masses and fragments of ironstone, argillaceous limestone, red 
clay, porphyry, white felspar, vitreous quartz, and blende ; but in the 
cliffs which range far to the west, the dogger is distinguished only by 
its very irony composition, and largely nodular structure. In some 
places it is even but little distinguishable from common sandstone, or is 
deficient altogether. Its utmost thickness is about sixty feet. 
In consequence of its own characters, its position upon the lias, and 
its evident assimilation to the upper lias shale, I think it may be con- 
cluded that the concbiferous dogger beds at Blue Wick are the repre- 
sentatives in Yorkshire of the inferior oolite and sand of Somersetshire. 
What light the fossils contribute to this inquiry, will be seen hereafter. 
The sandstones and shale, with fossil plants and coal, (No. 13,) 
which succeed and cover the conchiferous series just described, occupy 
* See Professor Sedgwick’s remarks on this subject, Ann. Phil. May, 1826 . 
+ I take this occasion of expressing my thanks to the Rev. L. V . Vernon, for the valuable infor- 
mation he has afforded me on the geology of the Cleveland hills. 
