Mr. Rose’s Sketch of the Geology of West Norfolk. 35 
beach is immediately incumbent on the breccia of the green- 
sand, five feet above the level of the present beach, and rises 
towards the east from Lynn bay ; consequently it inclines in 
an opposite direction to the regular strata. I purpose taking 
the earliest opportunity of prosecuting my research into this in- 
teresting relic of * olden time,” to trace its course and extent, 
and particularly to explore it for testaceous exuviz ; at present 
none have been seen. Mr. E. Mugridge, at my request, has 
endeavoured to trace the course of the old beach, and thinks 
it rises to the surface at a part of the cliff which is about 40 
feet high. 
Alluvium of Marshland.—Marshland is part of the Bedford 
Level, forms the western boundary of this county, and con- 
tains about 63,000 acres of low-Jand. It is geologically com- 
posed of alternating beds of lacustrine silt and peat (covering, 
in the immediate vicinity of Lynn, a marine silt), lying upon 
a stiff clay inclosing small nodules of chalk, the whole re- 
posing on the Oxford clay. 
The various canals and dikes cut for inland navigation and 
for the drainage of the Level have exposed the beds above 
mentioned. ‘lhe following are the sectzons I have been able to 
procure. At Salter’s Lode, near Downham, “ the silt was 
observed to be ten feet deep; and next below that, three feet 
thicknesse of firm moor; then bluish gault, which the work- 
men judged to have been silt originally, because being dry, it 
not only crumbled, like it, but had the roots of reeds in it; 
then below it moor of three feet thicknesse, much firmer and 
clearer than the other; and lastly, whitish clay, which is sup- 
posed to have been the very natural and bottome soyle at the 
first, before those changes happened, either from the altera- 
tion of the course of the sea, or choaking up of these out- 
falls” * . 
In making the Eau-brink Cut near Lynn the beds were 
found arranged in the following manner: 
1. Vegetable soil, and brown clay with sand... ... 4 ft. 
2. Blue clay, a brick-earth =... 2. ee nee wee 8 
3. Peat, containing bones and horns of ru- othe 
vi) SE I eee eer Sa Sea } 0% 
Blue clay, similar to No.2. ... 0 20. see eee ae 8 
. Peat, with alder and hazel bushes; the lower seth, 3 
tion clay, containing roots of marsh plants ... 
. Dark blue clay, a marine silt, containing the fol- 
lowing shells in great abundance: Cardium edule, 
Mytilus edulis, Tellina solidula, Lutraria com- 
* 
nn 
for) 
* Dugdale on Embanking, &c. Edit. 1662, page 178. 
I 2 
