INTRODUCTION. 
A . , ti,,^ Works referred to in which the 
determinations occur. 
J. 
J. W. Judd 
The Speeton Clay. Q. J. G. S.,vol. xxiv., 1868 
K. 
W. Keeping and C. S. 
Geol. Mag., Dec. II., vol. x., 1883. 
Middlemiss. 
La. 
G. W. Lamplugh 
Subdivisions of the Speeton Clay. Q. J. G. S., 
vol. xlv., p. 575. 
Le. 
J. Leckenby 
Kelkrway Fossils. Q. J. G. S., vol. xv., p. 4, 1859, 
Oolitic Plants. Q. J. G. S., vol. xx., p. 74, 1864. 
Ly. 
J. Lycett 
L 
Supplement to the Gt. Oolite ~) 
Moll., 1 863 - 1 Mon. of the Pal. 
The Fossil Trigoniae, f Soc. 
1872-83 - -J 
L. 
Lycett and Morris 
The Great Oolite Mollusca, 1850-53-55. Mon. 
of the Pal. Soc. 
M. 
N. 
J. Morris 
A. G. Nathorst - 
Catalogue of British Fossils, 1854. 
Ofversigt af K. Vetens. Akad. Forhandlingar, 
1880, No. 5 and 9. 
0. 
A. Oppel 
Die Juraformation, 1856-58. 
Ow. 
K. Owen - 
The Eeptilia of the Liassic Formations. Mon. 
of the Pal. Soc., 1861-81. 
r 
The Geology of the Yorkshire Coast, 1829-35-74. 
P. 
J. Phillips - J 
Mon. on the Belemnitida?, 1865-70. 
1 
Geol. of Oxford and the Thames Valley, 1871. 
PI. 
H. M, Platnauer - 
Kep. York. Phil. Soc., 1886-91. 
Pv. 
A. Pavlow and G. W 
Argiles de Speeton et leurs equivalents, 1892. 
Lamplugh. 
S. 
Geol. Survey 
Explanations of the Geol. Survey maps of this 
district, 1880-88, or entered in the books of 
the Palaeontological Department of the Surrey. 
Si. 
M. Simpson 
The Fossils of the Yorkshire Lias, 1855 and 84. 
T. 
Tate and Blake - 
The Yorkshire Lias, 1876. 
W. 
W. C. Williamson 
Trans. Geol. Soc., Ser. 2, vol. v., p. 223, 1837, 
and vol. vi., p. 143, 1841. 
Wr. 
T. Wright 
Q. J.G. S., vol. xvi. ; Cottesw. Nat, Club for 
1869, p. 141 ; and the Mon. of the Pal. Soc., 
(Ool. Echinodermata) 1857-80, (Lias Ammo- 
nites) 1878-86. 
Wk. 
J. F. Walker - 
Proc. Yorksh. Phil. Soc., 1877 and 1889 ; also 
Davidson's Suppl. to the Mon. on the Brachio- 
poda, 1874-82. 
Wo. 
A. Smith Woodward 
Geol. Mag,, 1886. 
Museums. 
Bm. 
British Museum. 
Cm. 
Woodwardian Museum, Cambridge. 
Jm. 
Museum of Practical Geology, 28, Jermyn Street, London. 
Mm 
Mai ton Museum. 
Sm. 
Scarborough Museum. 
Wm. 
Whitby Museum. 
Ym. 
Museum of the Yorkshire Philosophical Society, York. 
- 
Indicates that species occur at this horizon although there is no special 
reference to the fact. 
