122 Field Meetings, 1906. 
collect fossils and Rock specimens illustrating the Neocomian 
series. Thanks to the facilities afforded the Union, some good 
representative specimens were obtained. 
The typical sub-divisions of the Lower Cretaceous rocks in 
Lincolnshire are :— 
Carstone. 
Tealby Limestone, 
Tealby Beds. Tealby Clay, 
_ Claxby Ironstone. 
Spilsby Sandstone. 
The floor of the ancient sea upon which these rocks were laid 
down was the Clay now known as Kimmeridge Clay, the upper- 
most member of the Jurassic rocks in Lincolnshire; and the 
junction of this clay with the Spilsby Sandstone is marked by a 
layer of rolled phosphatic nodules which contain fossils derived 
from the Kimmeridge Clay, indicating a lineof unconformity 
between the two beds. The dry land of the Jurassic age was 
slowly subsiding, and in the shallow water which was then 
encroaching on what is now Lincolnshire, the Lower Cretaceous 
beds were formed. The first deposit in these shallow waters was 
the Spilsby Sandstone ; and following this, in the varying depths 
of the encroaching sea, the Tealby Beds, and the Carstone, were 
laid down. Whilst this was going on a thick bed of Marine Clay 
known as the Speeton Clays, were accumulating in Yorkshire ; and 
about at the same period the great Fresh Water and Estuarine beds 
of the Wealden Formation were being accumulated in the South 
East of England. In Lincolnshire there is a more complete 
succession of Marine deposits of Lower Cretaceous Age than is to 
be found in any other part of England. 
Passing Eastwards along the railway from Donnington-on- 
Bain, some good sections of the Spilsby Sandstone are seen, A 
very interesting form is seen in the Sand-pit close to the station. 
Here the Sand is fine-grained, pale yellow or green in colour, and 
often stained a deep red by the presence of iron oxide. Micro- 
scopically the grains exhibit much rounding as though subjected 
to wind action, other sections along the Railway shew the vari- 
able character of this sandstone, Sometimes it is a grey caf- 
