LOWER OOLITIC ROCKS OF ENGLAND: 
FT. 

IN. 
Cornbrasli 
1 
Brown brashy clay ... 
^Calcareous and fissile gritty rock, with 
Ostrea costata - - -16 
Busty brown and grey clay and rubbly 
calcareous and ferruginous grit, with 
Ostrea flabelloides (abundant), Lima, 
&c. - - -1 6 to 2 
(_Fissile calcareous gritty rock - 2 6 
The greatest thickness of the Cornbrasli appears to be 19 feet, judging 
by the record of a well at Pinchbeck North Fen, between Folkingham and 
Spaiding; but it was estimated at 5 ft. 9 in. in a well-section at Swarby, 
south-west of Sleaford. In the latter case probably the full thickness of 
the Cornbrash was not passed through, for at Aswarby a little to the 
south-east the thickness was proved to be 15 feet. A deep well at 
Quarrington reached Upper Lias at a depth of about 295 feet.* (See also 
p. 426.) 
Sleaford to Sudbrook, Appleby, and Winterton. 
The Cornbrash has been exposed at Sleaford Station, but we 
have no records of any important sections along the outcrop from 
this neighbourhood onwards to that of Lincoln. Ferruginous and 
shelly limestone has been opened up near Scopwick, and near 
Cherry Willingham similar stone and siliceous ragstone have 
been observed by Mr. W. H. Penning. 
Tho shallow quarries in Sudbrook Park, north-east of Lincoln, 
expose about 4 feet of rubbly and shelly limestone, yielding (with 
iive exceptions) the following species : 
Acrodus. 
Ammonites Bakeriae. 
macrocephalus. 
Alaria. 
Chemnitzia? 
Natica punctura. 
Nerinaaa. 
Plenrotomaria. 
Astarte ungulata. 
Avicula echinata. 
Ceromya concentrica. 
Gervillia. 
Groniomya v. scripta. 
Gresslya peregrina. 
Isocardia minima. 
Lima gibbosa. 
rigidula. 
Lucina burtonensis. 
Modiola bipartita. 
imbricata. 
Myacites calceiformis. 
decurtatus. 
Nuciila. 
Ostrea acuminata. 
flabelloides. 
Pecten articulatus. 
demissus. 
lens. 
vagans. 
Pholadomya deltoidea. 
Pholadomya lyrata. 
ovalis. 
parvula. 
Placunopsis. 
Quenstedtia laevigata. Nor- 
man by. 
Trigonia elongata. 
Moretoni. 
scarburgensis. 
Unicardium gibbosum. Nor* 
manby. 
Rhynchonella concinna. 
Morierei ? 
varians. Cherry Willing- 
ham. 
Terebratula intermedia. 
Waldheimia obovata. 
ornithocephala. 
Serpula coiiYoluta. 
deplexa. 
Acrosalenia spinosa. 
Wiltoni. 
Clypeus Ploti. 
Echinobrissus clunicularis. 
orbicularis. 
Holectypus depressus. Nor- 
manby. 
Pseudodiadema. 
Anabacia complanata. Nor- 
manby. 
* Jukes-Browne, Geol. S.W. Lincolnshire, pp. 139, 152, 153, 156. 
