184 
THE LOWER OOLITIC ROCKS OF YORKSHIRE. 
BY LINSDALL RICHARDSON, F.R.S.E., F.L.S., F.G.S. 
(Plates XXII.— XXIV.) 
CONTENTS. 
PAGE 
1. Introduction . . . . . . . . . . . . . . . . 184 
II. Sub-divisions recognizable in the Lower Oolitic Rocks of 
Yorkshire 192 
APPENDICES. 
1. Ammonites from the Scarborough Limestone, by S. S. Buck- 
man, F.G.S 205 
11. (-'omparison of the uppermost Toarcian Deposits in Yorkshire 
and the Cotteswolds, by S. S. Buckman, F.G.S 209 
lU. Notes on some Yorkshire Echinoids, by E. T. Paris, F.C.S. .. 213 
I. INTRODUCTION. 
Iq the summer of 1908 Mr. E. T. Paris and I spent some time 
visiting the principal sections of the Lower OoHtes of Yorkshire 
with a view to seeing if it were possible to correlate these beds 
any more precisely than had already been done with those of the 
same series in the south-west of England. After my return, 
iVfr. R. S. Herries very kindly lent me all the echinoids, brachiopods^ 
and ammonites that he had collected from the Yorkshire Lower 
Oolites, and while Mi\ Paris has named the echinoids, Mr. S. S. 
Buckman has identified the ammonites and has most kindl}^ 
contributed two appendices to the present paper — the one des- 
criptive of some ammonites from the Scarborough Limestone, 
the other comparing the uppermost Upper-Lias deposits in York- 
shire and the Cotteswolds. 
In Yorkshire the beds that intervene between the Cornhrash 
and the U])per Lias Clay are mainly sandstones and shales of 
estuarine origin, but with four marine bands, whose upper and 
lower limits are ofttimes none too well defined. They are : — 
[Cornbrash.] 
(1) The Scarborough Limestone. 
(2) The Millepore Limestone. 
(3) The Eller-Beck Bed, and? 
(4) The Dogger. 
[The Blea-Wyke Beds.] 
In Table I. wiU be found detailed the princi^Dal sub-divisions 
that have ])een made of the Yorkshire Lower Oolites. 
