'UPPER LIAS: STAMFORD. 283 
were noted by Mr. Thompson ;* and others, collected by myself, 
w ere identified by Messrs. Newton and Sherman : 
Ammonites bifrons. 
communis. 
cornucopiae. 
heterophyllus. 
Holandrei. 
serpentinus. 
Belemnites compressus. 
Gasteropods. 
Leda ovum. 
Nucula Hammeri. 
Trigonia pulcliella. 
Prof. Judd mentions that in Keythorpe Park, a pond, dug in 
the lower part of the Upper Lias Clays, exhibited the richly 
fossiliferous bands, crowded with small Ammonites, &c., which 
characterize that part of the series (see Fig. 69, p. 235). He 
collected there the following fossils : | 
Ammonites communis. (Very 
abundant.) 
annulatus. (Very abundant.) 
Holandrei. 
Ammonites bifrons. 
Belemnites compressus. 
Leda ovum. 
Inoceramus dubius. 
The clays, and their junction with the Northampton Sands, were 
shown in brickyards at Uppingham ; exposures were also to be 
seen in the railway-cuttings and brickyard near Manton. 
Pilton brickyard, situated south of the railway, S.W. of 
North Luffenham, showed about 12 feet of blue clay overlaid by 
6 feet of brown clay. Ferruginous nodules and septaria occur, 
and iron-pyrites and large crystals o selenite abound. Belemnites 
are more abundant towards the top of the beds. Ammonites 
bifrons, Leda ovum, and other fossils occur in the clays and in 
nodules. 
The great Stamford and Helpstone fault also brings up the 
Upper Lias along the valley of the Wansford Brook, as pointed 
out by Prof. Judd. The beds were exposed at Thornhaugh, and 
a well was sunk there for upwards of 70 feet in blue clay 
without reaching the bottom of it. 
Prof. Judd states that at Helpstone brickyard, north-west of 
Peterborough, there was an interesting exposure of the Upper 
Lias clay in a small inlier, which has been produced in conse- 
quence of the removal by denudation of the upper part of a small 
anticlinal, into which the beds are here bent. The beds consist 
of blue pyritous clays with much selenite, and are the highest of 
the series ; they yield, 
Ammonites bifrons. Abundant. 
serpentinus. Rare. 
Belemnites compressus. 
Leda ovum. 
At Stamford the Upper Lias clay forms the bed of the river ; 
in a deep excavation made at the gas-works Prof. Judd found 
Ammonites bifrons, Belemnites compressus, Leda ovum, &c. The 
same beds are met with in many wells in the southern part of 
Stamford, where the Stamford and Helpstone fault has thrown 
the Upper Lias clay to a much higher level. Tlie Upper Lias 
* Thompson, Journ. Northamptonsh. Nat. Hist. Soc., vol. iv. p. 16. 
f Gcol. Rutland, pp. 83, 84. 
