CORNBHASI1 : BEDFORD. 
451 
Cornbrash is persistent, but that it occupies a more extensive 
tract in the country to the north-west of Olney and Harrold, and 
west of Sharnbrook, than was shown on the Geological Survey 
Map. It had been supposed that the Cornbrash died out at Keinp- 
ston in the vicinity of Bedford,* as the outcrop had not been 
traced so far as Stagsden, on the south side of ihe Ouse Valley ; 
although it was continuously mapped from Clapham northwards, 
on the other side of the valley. 
The presence o Cornbrash near Bedford was known in the 
arly days of geology, the rubble on the surface of the " Bedford 
Limestone " being called " Cornbrash soil/'f The term " Bed- 
ford Limestone " would apply most appropriately to the Great 
Oolite Limestone, which is quarried on the west side of the town ; 
but in old days the name seems to have been given to the Corn- 
brash, and judging by the fossils mentioned by Parkinson, to 
have included also the Kellaways Itoek.J Among the fossils of 
the Cornbrash are Ammonites discus, Ostrca flabelloides, Pectcn 
demissus, P. vagans, Waldheimia ornithocephala, W. obovata, &c., 
the known species being all included in the list (p. 453) from 
Oundle, &c. 
At Franklin's Pit, by the Waterworks, Bedford, I noted the 
following section, in company with Mr. Topley, and under the 
guidance of Mr. Cameron : 
FT. IN. 
f Sands and clays. 
I Clay - - - - - 10 
Stone, termed " Pendle rock " 2 to 3 
("Mottled yellow green, red, grey, "1 
I and purplish clay with selenite I , , -.Q Q 
| Dark carbonaceous clay, with con- f 
I cretionary ferruginous bed -J 
{Tough grey limestones, and shaly beds, 
obtained in massive blocks : some 
beds 3 feet thick - - 12 
At Bone .or Bourne End, Bletsoe, the following section was 
noted: 
Kellaways 
Beds. 
Cornbrash 
Great Oolite 
Clay. 
Great Oolite 
Limestone. 
Kellaways 
Beds. 
Cornbrash 
f Grey and yellow clay, overlaid by 
greenish and yellowish sand, con- 
l cretionary in places - 
f Sandy and calcareoiis lissile layers with 
- \ Ostrea fiabelloides 
[ Tough grey and brown limestone 
(Water.) 
FT. IN. 
The Cornbrash here yields Ammonites macroccphalus, Pecten, 
Pholadomya, and Waldheimia lagenalis. 
The brickyard f mile north-west of "West End, Stevington, 
showed, beneath the Kellaways sands and clays, a band of tough 
shelly limestone representing the Cornbrash. This bed yielded 
* A. C. Ramsay, Address to Geol. SDC. 1864, p. 28. 
t Sowerby, Mineral Conchology, Supp. Index to vol. i., arranged by John Farey ; 
also W. Phillips, Geol. Eng. and Wales, 1818, p. 63. 
J Parkinson, Organic Eemains, vol. iii. p. 446. 
F F 2 
