DAVIS : SECTIONS IN THE LIASSIC AND OOLITIC ROCKS OF YORKSHIRE. 173 
river diagonally, and this causes a peculiar effect, the beds dip east 
in the eastern half of the dale and west in the western half. At the 
southern extremity of Robin Hood's Bay is the Peak Fault, by which 
the base of the Middle Lias is brought into a line with the top of the 
Upper Lias, indicating a throw of more than 400 feet. The indica- 
tion of the fault inland is shown under Crag Hall, where the Dogger 
abuts against Grey Limestone. The country south is buried in 
Boulder Clays and the fault is difficult to trace, There are indi- 
cations of it between Pye Rigg and Bell Hill, and southwards it runs 
west of Cloughton, where the Moor Grit, which crops out in the 
village, is also seen 100 feet higher, capping Ripley's Bauk. The 
country south of Cloughton is covered with Boulder Clay, but it is 
probable that the faults occurring at Scarborough Castle may be a 
continuation of the same line of disturbance. At Hayburn Wyke 
there is an anticlinal which may indicate a branch of the Peak Fault, 
but its connection is by no means very clear. South of Scarborough 
the coast section exposes great thicknesses of Boulder Clay with the 
Estuarine Series and the Oxford Clay beneath, at White Nab and 
Osgodby Nab. At Red Cliff the fine section exposing the series from 
the Cornbrash up to the Lower Calcareous Grit is cut off by a fault 
which brings the Estuarine Series again into view at the northern 
extremity of Gristhorpe Bay. The Gristhorpe Cliffs, further south, 
afford a magnificent section of the strata between the Cornbrash and 
Kelloway Rock and the Lower Calcareous Grit. The section is con- 
tinuous to Filey Brig, where the Passage Beds and probably the 
equivalent of the lower beds of the Coralline Oolites are exposed. 
South of Filey the Boulder Clays fill up the coast of the Bay, envel- 
loping the Kimmeridge Clay (see fig. 1). 
The drainage of the northern portion of the district is conveyed 
by the River Esk to the sea at Whitby. South of the valley of the 
Esk the River Derwent and its tributaries run into the Ouse ; and 
the whole of this district is drained westwards, away from the coast, 
and eventually reaches the sea by way of the Humber. The Esk and 
its tributaries form a series of dales, of which the most important, 
Glaizedale, Fryup, Danbydale, and Westerdale are cut through the 
Oolitic Sandstones deep into the Liassic Rocks ; about one hundred 
