176 LIAS OF ENGLAND AND WALES : 
Mr. Dalton mentions that calcareous sandstone was at one time 
worked for road-metal at Haddington and Thorpe-on-the-Hill, 
where the beds form a marked feature ; but their further extension 
northwards is very doubtful. Beds of sandy Lias occur at 
Broxholme, but they are considered by Mr. Dalton to be on a 
higher horizon. Ferruginous rubbly limestones occur also at 
Stow and Willmgham, and these beds are considered by Mr. 
Ussher to belong most likely to the zone of Ammonites semi- 
costatus. There are however*no indications in this region of the 
valuable ironstone met with on this horizon still further north. 
A brickyard south-east of Bassinghani showed the following- 
section, which was noted by Mr. Dalton : * 
FT. IN. 
Soil and Drift clay - 1 6 
Lower Lias. ["Clay - 1 6 
Zone of \ Ferruginous sandstone - - 2 
Ammonites | Fossiliferous calcareous rock - 2 
armatus. LBlue clay - - - - 6 
The following fossils were obtained here by Mr. Rhodes: 
Ammonites subplanieosta. 
Avicula inaequivalvis. 
Cardinia Listeri. 
Gryphaea cymbium. 
Modiola scalprum. 
Pecten lunularis. 
Pholadomya ambigua. 
Pinna Hartmanni. 
Pleuromya. 
Pentacrinus. 
The beds are considered to belong to the zone of Ammonites 
armatus, which in the area to the south, near Brcughton-on- 
Brant, and in some other localities, includes beds of a sandy 
nature. 
Ironstone was noticed in these beds east of Broxholme, suggest- 
ing that the formation of this ore occurs at different horizons, 
according to the presence of porous layers here and there in the 
Liias clays. This band appears to range northward by Broxholme, 
and Thorpe-in-the-Fallows to Contes. 
The uppermost beds of the Lower Lias have been well exposed 
in the brickyard north of Waddington railway-station. There 
about 30 feet of clay has been dug, the uppermost 6 feet of 
it being regarded by Mr. Ussher as belonging to the base of 
the Middle Lias ; below, the beds consist of grey clay with ferru- 
ginous septaria and cement-stones. The following fossils were 
obtained : t 
Ammonites capricornus. 
striatus. 
subplanicosta. 
Belemnites clavatus. 
Actseonina. 
Amberleya imbricata. 
Cardium truncatum. 
Gervillia laevis. 
Goniomya. 
Leda galathea ? 
Modiola scalprum. 
Ostrea. 
Pecten jequivalvis. 
Thiollieri ? 
Pholadomya ambigua. 
Pleuromya costata. 
Plicatula spinosa. 
Unicardium. 
Rhynchonella variabilis. 
* Geology of Lincoln, p. 21. 
f Ibid., p. 22. 
