GREAT OOLITE SERIES : STAMFORD. 417 
FT. IN. 
Black, carbonaceous bed - 1 to 2 
Grey clay with, masses of jet - 2 
Tipper | " Skerry," a hard gritty clay used for 
Estuarine <( making fire-bricks. It resembles in 
Series. | texture the "root-beds," but has no 
vertical plant remains 8 
Grey clay, blackish in places (but makes 
fine white bricks and is estimated the 
best clay in the pit) - - 4 
White clays, very sandy in places 5 
Light reddish-brown clay, fall of wood 1 
Ironstone junction-band - - 1 
Lincolnshire Limestone - - - - - 74 
r -o j ^ C f Sands and ironstone. 
In the " skerry " and the clays below it, iron-pyrites abounds. The 
total thickness of the Upper Estuarine Series here is 27 feet. 
The upper clays burn into a red brick, the " skerry" into a fire-brick, 
and the grey clays below into a fine white brick. 
S. Sharp, who also described this section in somewhat different 
detail, records the following fossils from the Upper Estuarina 
Beds : 
Cyrena. 
Modiola imbricata. 
Lonsdalei. 
Neaera Ibbetsoni. 
Ostrea Sowerbyi. 
Pholadomya acuticosta. 
Tancredia angalata. 
From the same beds at Belmesthorpe he obtained remains 
of Tcleosaurus, Hybodus, &c.* He also notes the occurrence of 
Ammonites yracilis, Nautilus .Baberi, and other fossils from the 
Great Oolite Limestone north of Stamford. 
The accompanying section (Fig. 115) was noted by myself, with 
the exception of the upper beds (Nos. 8 and 9). 
Stamford to Castle Bytham. 
The Upper Estuarine Beds were well exposed in the railway- 
cuttings on the Great Northern Railway between Essendine and 
Careby. The strata were described in detail by Prof. Morris,f 
and as the cuttings are now for the most part obscured, his 
descriptions have been reproduced in the Survey Memoirs. The 
principal cutting, known as that of Danes' Hill, is situated west of 
Carlby, other sections were seen near Aunby and Careby. The 
beds were shown to a thickness of from 22 to 32 feet, and comprise 
grey and white, and black and green, shelly and sandy and bitu- 
minous clays, with beds of sandy and marly rock, containing 
vertical plant-markings and lignite. An oyster-bed was shown ac 
the top, and the usual ferruginous band at the base. Many fosdls 
are recorded by Sharp. (See Fig. 116, p. 421.) 
* Quart. Journ. Geol. Soc., vol. xxix. pp. 249, 25S. 
f Morris, Quart. Geol. Soc., vol. ix pp. 328-331 ; and Geol. Mag. 1869, p. 102 ; 
.Tudd, Geol. llutland, pp. 199, 209, 210; Sharp, Quart. Journ. Geol. Soc., vol. xxix. 
pp. 257, 258, 261-264. 
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