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LOWER OOLITIC ROCKS OF ENGLAND : 
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FT. IN. 
Hubble of Oolite (Hibaldstow Beds) and soil. 
Marly clay (seen also in pit by road) - - 5 to 6 
Top stone. Grey limestone, heavy and hard ; used for 
building- stone, paving, road-metal, and building-lime 
'Cement-layer. Bed of lime-" 
stone-shale forming natural 
cement 
Irregular beds of clay and f about 15 
limestone, like Lower Lias 
Kirton Beds. 
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in appearance - _, 
Thick beds of grey limestone with 
scattered oolitic grains - 3 to 3 6 
_Grey oolitic limestone - 1 2 
Lower beds of gritty rock, marl, and oolitic limestone, may be 
traced in the railway-cutting east of the tunnel, but they were not 
very clearly exposed. 
The only fossils obtained here by Mr. TJssher, were found in the 
upper beds below the marly clay. These were Homomya gibbosa, 
Lima pectintformis, and Pholadomya Heraulti.* Mr. H. Parry 
showed me (in 1889) an Ammonite from the top stone-bed, and 
this was sent to Mr. G. Sharman. He says it is one of the group 
of Ammonites that includes ^4. cymodoce, A.'rotundus, A.gottwrianus, 
&c. These species, which approximate closely in character, belong 
to the Middle Oolites ; hence considerable doubt is raised about 
the horizon of the specimen from Kirton, although I was assured 
that it did come from the stone in situ. Drift fossils however do 
get occasionally into crevices of the rocks. 
Mr. Ussher states that by the road to Kirton, at about a quarter 
of a mile north of the tunnel, a quarry exposes 15 feet of pale 
bluish-grey shaly clay, rather loamy ; it contains an even bed of 
tough limestone about a foot in thickness, and, near the base, 
nodular impersistent bands of limestone occur. These beds appear 
to rest upon the Kirton Beds; dark bluish-grey, impure, fossili- 
ferous, shaly limestones. Oolitic debris (Hibaldstow Beds) overlies 
the shaly clay. The following fossils (identified by Messrs. 
Sharman and Newton) were obtained from the limestone and 
shales : 
Amberleya gemmata. 
Cylindrites. 
Natica canaliculata. 
Gervillia acuta. 
Lima. 
Myacites. 
Ostrea. 
Pecten articxilatus. 
Pholadomya Heraulti. 
Quenstedtia oblita, 
Galeolaria socialis. 
Montlivaltia. 
Thecosmilia gregaria. 
The clayey division that occurs between the Kirton anil 
Hibaldstow Beds, was again seen near the Sturton Plantation 
N.E. of Manton. Here, according to Mr. Ussher, it is from 
3 to 8 feet thick, and contains Gervillia and numerous specimens 
of Trigonia hemispheerica. Northwards the clay or loam becomes 
* Geol. N. Lincolnshire, pp. 68, 69. 
