230 LIAS OF ENGLAND AND WALES : 
the Transition Bed. Mr. "Watford also points out that in Bavaria 
Dr. Stoliczka has recognized a similar fauna, and, from the 
Hierlatz and Adnether beds, has obtained many species of Liassic 
Mollusca. 
At Coton, north-west of Chacombe, the Marlstone is quarried 
for road-metal. It has yielded in this neighbourhood fine speci- 
mens of Pectcn cequivalvis, also Pleuromya costata, and Cardium 
truncatum. The lower beds of the rock are in places of a " slaty " 
nature, and I was informed by the Rev. W. A. Ayton that the 
porch in Chacombe Church was roofed with this material. 
At Thenford the Marlstone was formerly dug for building- 
stone. The beds have been opened up to a depth of 12 feet, with 
the Transition-bed and Upper Lias on top. (See p. 274.) 
Many other quarries have been opened up in the Marlstone and the 
basement-beds of the Upper Lias. Most of these have been described by 
Mr. Beeby Thompson.* In addition to the localities before mentioned, sec- 
tions have been noted at Wardington,f Byfield, Hellidon, Kingbrook north of 
Preston Capea,J Badby, Newnham, W.N.W. of Stowe-nine-churches, and 
nearer Northampton at Rothersthorpe, and Milton Malsor (or Middleton). 
In a boring at the Kettering road, Northampton, the thickness 
of the stone-beds was proved to be 21 feet ; and of the under- 
lying Middle and Lower Lias clays, 546 feet. Similar beds were 
proved at the London and North-Western Railway-station at 
Northampton. At Kingsthorpe, 760 feet of Upper, Middle, and 
Lower Lias were proved. (See p. 278.) At Harrington Dale, near 
Orton, west of Kettering, the Marlstone was but 6 feet thick, 
the underlying Middle Lias clays about 112 feet, and Lower Lias 
500 feet; and between Kettering and Weekley a boring proved 
18 feet of rock, beneath 44 feet of Upper Lias clay. 
With regard to the southerly and south-easterly extent of the 
Middle Lias we have but little evidence. The boring at Wytham, 
near Oxford, probably passed through beds of this age at depths of 
from 462 to about 500 feet : but the record is not sufficiently 
definite for precise statement?. A boring at Stratton Audley in 
Buckinghamshire, commenced in the Cornbrash, was carried to a 
depth of 243 feet, finding water, probably in the Marlstone. [| 
Far eastwards at Stony Stratford it was probably reached at a 
depth of 191 feet ; there its thickness appears to be 5 feet 
6 inches, and it rested on 18 feet of hard clay with occasional 
bands of rock. (See p. 277.) 
Over much of Northamptonshire, as in Oxfordshire, the 
boundary between Middle and Lower Lias (on the Geological 
* The Middle Lias of Northamptonshire, 1889. See also H. B. Woodward, 
Explanation of Horizontal Section. Sheet 140, p. 7. 
f Conybeare, who was at one time Curate of Wardington, has given a good 
account of the physical features of this district. Geol. Eng. and W*lc*, 1882, pp. 246, 
fcc. 
J H. B. Woodward, Explanation of Horizontal Section, Sheet 140, p. 7. 
H. J Eunson, Quart. Journ. Gcol. Soc., vol. xl. p. 484; Jcnrn. Northampton 
Nat. Hist, Soc., vol. ii., p. 29, vol. iv. p. 57 ; and Thompson, Mid. Lias, Northampt., 
p. 48. 
|| Green, Geol. Banbury, p. 23. 
