28 
PLATE II. 
FIG. 7. IRON-ORE, LOWER LIAS, FRODINGHAM, LINCOLNSHIRE. 
Oolitic grains of ferric oxide showing concentric structure ; also grains 
which appear to be psendomorphs (in ferric oxido) of rolled organic 
fragments. Matrix of calcite. 
FIG. 8. IRON-ORE, MIDDLE LIAS, EASTWELL, LEICESTERSHIRE. 
Organic fragments (noted by Mr. E. T. Newton as shells of Molluscs, 
Echinoderm plates, and calcareous Algae) in a matrix of colourless, 
crystalline carbonate. There is nothing in the appearance of the section 
to suggest that the rock is an ironstone. [It is the green ironstone, that 
is rejected by the workmen.] 
FIG. 9. IRON -ORE, MIDDLE LIAS, SHELTON MINE, CLEVELAND. 
Modified oolitic grains in a matrix which consists partly of an isotropic 
greenish substance, probably a silicate containing iron, and partly of a 
crystalline carbonate. 
The outer portions of the oolitic grains are formed of a ferriferous 
carbonate, the crystals of which show idiomorphic boundaries against the 
opaque nucleus. This nucleus appears white by reflected light. 
FIG. 10. IRON-ORE, MIDDLE LIAS, RAASAY, NEAR SKYE. 
Greenish oolitic grains showing concentric but not radial structures ; 
and fragments of such grains and organic fragments in a matrix of colour- 
less, crystalline carbonate. [See H. B. Woodward, G-eol. Mag., 1893, 
p. 493.] 
FIG. 11. IRON-SHOT LIMESTONE, CEPHALOPODA BED, INFERIOR OOLITE, 
WOTTON-UNDER-EDGE, GLOUCESTERSHIRE. 
Dark ferruginous oolitic grains showing concentric structure ; in 
brownish calcareous matrix showing many small quartz grains. 
FIG. 12. IRON-ORE, CORALLIAN BEDS, WESTBURY, WILTSHIRE. 
Reddish-brown oolitic grains showing concentric structure. 
The uucleas of one grain is a fragment of another grain. The matrix 
is yellowish-green, and contains numerous small detached grains of 
colourless calcite. 
