On the English side, a marshalling area was below the top of Shakespeare Cliff, the New Austrian Tunnelling method ( NATM ) was first applied in the chalk marl here.
12.
In the 1986 87 survey, previous findings were reinforced, and the characteristics of the gault clay and the tunnelling medium ( chalk marl that made up 85 % of the route ) were investigated.
13.
It is made from a chalk marl slab ( " Kalkmergelbank " ), has a height of and was formed almost 100 million years ago at the beginning of the Upper Cretaceous series in Cenomanian stage.
14.
The river terrace of the Leine had, in former times, laid down gravel to the north and south of the chalk marl step, that was later covered with loess and river loam ( " Auelehm " ).
