Ch. XIII.] 
CRAG OF NORFOLK. 
179 
represented, is 24 feet in height. Some of the layers in b, b, 
are composed of pebbles, and these alternate with thin beds 
- No. 40. 
Section east ofSherringham, Norfolk, 
a, Sand, loam, and blue clay, b , b, Sand and gravel, c, Twisted beds of loam. 
of loose sand. The whole set must once have been horizontal, 
and must have moved in a mass, or the relative position of 
the several parts would not have been preserved. Similar 
appearances may, perhaps, be produced when chasms open 
during earthquakes and portions of yielding strata fall in from 
above and are engulphed. 
Protruded masses of chalk. — But whatever opinion we may 
entertain on this point, we cannot^ doubt that subterranean 
No. 41 . 
Sea 
Side view of a promontory of chalk and crag, Trimmingham, Norfolk. 
, Gravel and ferruginous sand, rounded and angular pieces of chalk flint, wiih 
some quartz pebbles, 3 feet. 
b, Laminated blue clay, 8 feet. c, Yellow sand, 1 foot 6 inches. 
/, Dark blue clay with fragments of marine shells, 6 feet. 
, Yellow loam and flint gravel, 3 feet. /, Light blue clay, 1 foot. 
, Sand and loam, 12 feet. 
h, Yellow and white sand, loam, and gravel, tibout 100 feet. 
N2 
