242 
LOWER OOLITIC BOCKS OF ENGLAND 
Fuller's Earth 
Beds. 
Dark marl 
Bastard fuller's earth 
Dull black [earth] and selenite 
Light blue [earth] 
Fuller's earth 
Hard grey Btone - 
Tender stuff 
Black marl 
FT. IN 
6 
- 2 
- 1 
- 5 
- 2 
- 1 
- 4 
47 
The economic fuller's earth of the neighbourhood of Bath, is 
a bluish- or greenish-grey clay, that weathers to a brown or 
yellowish-brown colour. It is slightly calcareous and ferruginous, 
and contains small quantities of magnesia, soda, and potash. It 
is a soft dull earthy clay, having however a shining streak, and 
being somewhat greasy to the touch. Although apparently of 
an unctuous character, the clay possesses no plasticity, as when 
placed in water it forms no paste, but subsides as a pulpy impalp- 
able powder. The analyses of the earth kindly made by Mr. J. 
Hort Player (see p. 490) afford no clue to its fulling proper- 
ties, and these are therefore probably due to peculiar physical 
characters. 
The section of the beds at the Midford Fuller's Earth pits, 
between Midford Castle and the Cross Keys Inn, is as follows : 
FIG. 69. 
Section at Midford near Bath. 
Great Oolite. 
FT. IN. 
Upper 
Fuller's Earth < 
Clay. 
6. Soft marl and brown clay 5 
5. Dark bluish-grey clay - 4 
4. Brown marly clay with 
indurated bands of 
earthy marl, and ' ' beef " 
(fibrous carbonate of 
lime). Some lignite and 
many fossils - - 6 6 
3. Bastard fuller's earth: 
blue and yellow - - 1 6 
2. Soft marly stone - - 6 
1. Yellow fuller's earth, 
with occasional indu- 
rated bands and small 
hard nodules of earthy 
limestone. This earth 
passes laterally into the 
Blue earth further in 
the hill - - -50 
