RICHARDSON : THE LOWER OOLITIC ROCKS OF YORKSHIRE. 195 
Scarborough Beds. — Tliis term is suggested instead of that 
of " Scarborough Limestone," because limestone reaUy plays a 
very subordinate part in their composition. 
Over the greater part of the tract where the Lower OoUtic 
rocks occur in Yorkshire, the Scarborough Beds are divisible 
into three main portions : — 
(a) an upper portion in which shales predominate ; 
(6) a middle portion in which sandstone or grit is the main con- 
stituent ; and 
(c) a lower portion in which such limestones as do occur in the Scar- 
borough Beds are most in evidence. 
South of Scarborough these three divisions are not well- 
marked, and where the Beds first appear on the coast at Gris- 
thorpe Ba}' from beneath the younger rocks they do not measure 
more than from 3 to 7 feet. At White Xab (Plate XXII.), how- 
ever, they have increased to 30 feet in thickness and at one 
horizon in particular are replete with specimens of a Gervillia, 
which has generally been called Gervillia acuta, Phillips," but 
which ]Mr. Paris thinks is distinct, and to which he has given the 
name of Gervillia scarhurgensis. Here also a number of ammonites 
have been found, such as Teloceras coronatum (Qu. non Brug.), 
JStepheoceras svbcoronatum (Oppel), and Parkinsonia sp. (fragment). 
There is a certain amount of iron in the Scarborough Beds 
that are exposed in the sections south of the seaside resort whence 
the}^ derive their name, and as it oxidizes and imparts a red 
streaky appearance to the rocks, it is useful when seen in the 
matrices of fossils labelled simph" " Yorkshire Coast " as suggesting 
for them a south -Scarborough derivation. 
At Hundale Point, Cloughton W^^ke, the Scarborough Beds 
are readily accessible, very fossiliferous and weU-developed, and 
attain a thickness of 71 feet 2 inches. This increase is mainly 
due to the presence of a considerable thickness of shale, which is 
said to have " come in in the upper part." 
This section has been described at length by several authors 
and for the present purpose it will suffice to refer the reader to 
Fox-Strangways' record^ and to point out (1) that the four-foot 
bed referred to in that record as containing Pentacrinus {Isocrintis) 
is probabh^ on the horizon of the Crinoid-Grit of sections further 
west (on the Eston outlier, for example) ; (2) that Belemnites 
I "The Jurassic Rocks of Britain," Vol. 1. (1892), "Yorkshire," p. 232. 
