204 RICHARDSON : THP: lower oolitic rocks of YORKSHIRE. 
partiall}^ eroded, \\hile the sandstones with the black pebbles in 
them were being deposited. 
In the neighbourhood of the present " Peak " these crust- 
pressures found relief in faulting and while on the Scarborough 
side of the fault the Blea-Wyke Beds, Nerincea-Bed, and over- 
lying sandstone were 2:)reserved. on the other side the more ir- 
regularly developed and distributed equivalent beds were worked 
up (and the fossils in places commingled) or locally removed. Thus 
at the well-known fossiliferous locality of Glaisdale there is a 
curious assemblage of fossils. Rhynchonellids of the Rhyn. 
cynocephala-grou]p occur along with fossils that characterize the 
Pea-Grit of the Cheltenham district. 
In one form or another the Dogger occurs over the whole of 
the moorland tract of East Yorkshire ; but in the w estern portion 
it exhibits some features that merit special attention. Thus 
south of Rosedale is a mass of rock about 70 feet thick at the 
centre, which is extraordinarily magnetic^; while south of the 
Vittoria Plantation, Bilsdale, the Dogger is nearly 50 feet thick, 
full of a species of Acrosalenia , and lies in a hollow the bottom of 
which is within a few feet of the Jet Rock.- It is of interest and 
significance to note that the Lower Limestone of the Edge, Pains- 
wick, Gloucestershire, is also replete with the remains of crinoids 
and of Acrosalenia lycetti. 
In the Howardian Hills the Dogger does not appear as a rule 
to be very conspicuously developed ; but is prominent in the 
Derwent Valley at Kirkham, and its probable equivalent has been 
noticed at a very short distance below the Hydraulic Limestone 
in the bank alongside the railway at Castle Howard Station, where 
there seems also to be some representative of the Blea-Wyke 
Beds below. 
In South-east Yorkshire no very satisfactory sections of the 
Dogger have been noticed, and its representative is probably thin. 
The Dogger of the greater part of Yorkshire is without doubt 
mainly of murchisonce hemera^. In some places part of it may 
be of scissi date, and in others it contains fossils derived from 
yet earlier deposits. 
1 "The Jurassic Rocks of Britain," Vol. I. (1892), "Yorkshire," p. 448. 
2 I bid., p. 171. 
3 It may be as well to state that I asked Dr. F. L. Kitchin if the ammonites mentioned on pages 
166, 171 and 172 of the Geological Survey Memoir, " The Jurassic Rocks of Britain," Vol. 1., 
" Yorkshire," were in the Jermyn Street Museum. He replied that they were not, and added 
" I do not know on whose authority the specimens were recorded." 
