312 
ELEMEN'rS OF GEOLOGY. 
MIDDLE KEOCOMIAK. 
Tealby Series—At Tealby, a village in the Lincolnshire 
Wolds, there crop out beneath the white chalk some non- 
fossiliferous ferruginous sands about twenty feet thick, be¬ 
neath which are beds of clay and limestone, about fifty feet 
thick, with an interesting suite of fossils, among which are 
Pecten cinctiis (Fig. 285), from 9 to 12 inches in diameter, 
Ancyloceras Piivcdlei (Fig. 286), and some forty other shells, 
many of them common to the Middle Speeton clay, about to 
Fig. 285. 
Fig. 286. 
Pecten cinctus. Sow. (P. crassitesta,Tlom.) 
Middle Neocomiaii, England; Middle 
and LowerNeocomian, Germany. One- 
fifth natural size. 
Ancyloceras (Crioceras) Duvallei^ 
Leveille. Middle and Lower 
Neocomian. One-fifth natural 
size. 
be mentioned. Mr. Judd remarks that as Ammonites clypei- 
formis and Terebratida hippopus characterize the Middle 
JSTeocomian of the Continent, it is to this stage that the Teal¬ 
by series containing the same fossils may be assigned.* 
The middle division of the Speeton clay, occurring at Spee¬ 
ton below the cement-bed, before alluded to, is 150 feet thick, 
and contains about 39 species of mollusca, half of which are 
common to the overlying clay. Among the peculiar shells, 
Pecten cinctus (Fig. 285) and Ancyloceras {Crioceras) Duval- 
lei (Fig. 286) occur. 
LOWER KEOCOMIAN. 
In the lower division of the Speeton clay, 200 feet thick, 
46 species of mollusca have been found, and three divisions, 
each characterized by its peculiar ammonite, have been no¬ 
ticed by Mr. Judd. The central zone is marked by Ammoni¬ 
tes Noricus (see Fig, 287, p. 313). On the Continent these beds 
are well known by their corresponding fossils, the Hils clay 
and conglomerate of the north of Germany agreeing with 
* Judd, Quart, Geol. Journ., 1867, vol. xxiii,, p. 249. 
