Surveyed Sept. 17th, 1915. 
380 Sheppard: A Yorkshire Dene Hole. 
flint 3 inches to 5 inches in thickness, and interspersed among 
the chalk are nodules of flint, in many cases obviously formed 
around sponges. The chalk contains few fossils. 
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At the present time an enormous quantity of clay has to 
be removed and carried away before the chalk can be quarried. 
It is fairly obvious that the cave was made in the form of 
a tunnel in order to extract as much chalk as possible without 
removing the mass of clay which covered it. With regard to 
Naturalist, 
Plan and Section of Dene Hole, near Cottingham. East Yorks. 
