320 
THE CRETACEOUS ROCKS OE BRITAIN. 
Lincolnshire, two miles west of Barton-on-Humber.—Chiefly 
amorphous matter, but more calcareous than the last; a few 
minute mineral grains can be seen, and several others of a bright 
green colour (probably glauconite) occur. Small calcareous par¬ 
ticles, probably of shell, are sparingly scattered through the 
matrix, but there are no “ spheres,” and very few foraminiferal 
cells. 
In Bedfordshire, Hertfordshire, and Cambridgeshire the marl is 
full of small particles of shell, foraminiferal cells, “ spheres,” a few 
larger Globigerinoe and here and there a Textularia ; the relative 
amount of the recognisable organic ingredients varies greatly, the 
total varying from 30 to 80 per cent. For example—in the lower 
band at Pitstone, near Tring, about 60 per cent, of the Marl 
consists of “ spheres,” and cells, with a few larger Foraminifera 
and shell-fragments, “ spheres ” largely preponderating. 
Near Luton the upper marl bed chiefly consists of amorphous, 
structureless material with few “ spheres ” or cells or larger Gloin- 
gerince, but the mass is full of minute calcitic particles, probably 
shell, with a few larger fragments. At Cadwell, near Hitchin, 
where the hard white rock which occurs between the marly bands 
has been broken up and a nodular rock takes its place, the marl 
is very full of coarse shell-fragments, “ spheres ” and Foraminifera, 
shell-fragments predominating, the recognisable organic particles 
being from 70 to 80 per cent, of the Marl. At Litlington, near 
Boyston, the marl has a similar shelly character. 
A specimen from Winchester also consists largely of amorphous 
material. Mineral grains are rare. Foraminiferal cells, “spheres,” 
minute Globigerinoe, with a few larger ones, are common, and are 
accompanied by many small shelly particles. - 
At Cerne, in Dorset, the material is chiefly amorphous, with small 
particles, probably derived from shells scattered sparingly through¬ 
out it, and here and there a coarser fragment; but few forami¬ 
niferal cells or “spheres.” Mineral grains of minute size can be 
discerned throughout the mass. 
In specimens from the south coast sections, the Isle of Wight, 
Eastbourne, and Dover, shelly particles are rarer, large forami¬ 
nifera are more frequently seen, but cells and “ spheres ” are often 
extremely abundant, especially at Dover. 
Examination of Washings. 
Portions of most of the specimens which were treated with acid 
were also broken up in water and the finest part removed by leviga- 
tion. As there is some difference in the results from this process 
in each specimen they will be considered separately. 
South Cave .—After washing, the coarse particles of this specimen 
resolved themselves into thin, ffat, flaky fragments, which remained 
intact after repeated wetting and drying. Foraminifera were 
