222 
LOWER OOLITIC ROOKS Or ENGLAND: 
boundary-line, and occupy the lower part of the dip-slope, termi- 
nated by the Alluvium between th Barnetby and Doncaster railway 
and Hibaldstow, and by the gravel-flats south of Hibaldstow. 
Between Waddingham and Grayingham Warren Farm, there 
are limestones, referred by Mr. Ussher to the Hibaldstow Beds, 
which are similar in colour "and texture to those commonly found in 
the^Kirton Beds, yet they pass directly under the Great Oolite series. 
The Hibaldstow Beds, which are distinctly traceable south of a 
line between Grayingham Warren Farm and Waddingham, seem 
to preserve their very oolitic aspect only in their lower beds, and 
cannot be traced southwards as a distinct lithological division. 
The Kirton Beds lose their distinctive characters south of Gray- 
ingham Warren. By these changes we find as we proceed south- 
ward, a more and more homogeneous series of beds composing the 
Lincolnshire Limestone.* Nevertheless, in certain areas, as before 
mentioned, divisions that appear to correspond with the Hibaldstow 
and Kirton Beds, may be traced further south. (See p. 216.) 
The following fossils have been recorded from these local 
divisions of the Lincolnshire Limestone : 
Kirton Beds. 
Hibaldstow 
Beds. 
Ammonites (allied to A. humphriesianus) 
X 
(allied to A. Truellei) 
X 
Belemnites - - 
X 
Natica cincta - - 
X 
Astarte elegans (Fig. 12) 
X 
minima - - - 
X 
rhomboidalis - ... 
X 
Ceromya bajociana (Fig. 21) - 
X 
Corbis Lajoyei, var. cingenda - 
X 
Gervillia acuta 
X 
X 
Gresslya Lycetti ? 
X 
Hinnites abjectus - 
X 
X 
Homomya gibbosa 
X 
X 
Lima pectinifoniris .... 
X 
X 
Lycetti ? - 
X 
strigillata 
X 
X 
Lithodomus - - 
X 
X 
Lucina bellona 
X 
X 
Myacites jurassi - 
X 
Ostrea - 
X 
Pecten aratus - 
X 
X 
articulatus ..... 
X 
X 
lens ..... 
X 
X 
Pholadornya fidicula - ... 
X 
X 
Heraulti -----. 
X 
X 
Pinna lanceolata - - 
X 
Quenstedtia oblita ..... 
X 
Trichites nodosus - - - - 
X 
Trigonia heniisphserica .... 
Terebratula maxillata - - - 
X 
X 
Galeolaria (Serpula) socialis 
X 
Judging from the foregoing list, there appears to be no marked 
palseontological distinction between the beds. The Kirton Beds 
* Ussher, Geol. N. Lincolnshire, pp. 63, 64. 
