File:The Quarterly journal of the Geological Society of London (12683224815).jpg

1856.. WRIGHT UPPER LIAS SANDS.
Fig. 2. — Section of Frocester Hill, near Stonehouse.
303
a, b, c. Inferior Oolite ; 70 feet.
D, B. Calcareo-ferruginous sandstone (Cephalopoda-bed) ; 6 feet ")
F. Yellow and brown sands, with inconstant and concretionary V" Upper Lias Sands."
bands of calcareous sandstone ; 1 50 feet ? J
G. Upper Lias shale ; 80 feet.
H. Marlstone ; hard calcareous sandstone, resting on brown and grey sands, with bands
and nodules of ferruginous sandstone ; 150 feet.
I. Lower Lias shale.
Inferior Oolite.
Ft. in.
a.
h.
A fine-grained oolitic limestone, similar to the freestone of
Birdlip, Painswick, and Leckhampton Hills ; the upper
beds exhibit a most remarkable example of oblique bed-
ding, the flaggy layers of which rest horizontally on in-
chned beds of freestone : thickness about 50
A coarse, hght-cream-coloured, gritty, crystalline oohte,
traversed at intervals by shelly layers extremely crystal-
line ; a great part of the rock appears to be composed
of the fragments and plates of Crinoidea, the plates and
spines of Echinidce, and comminuted fragments of the
shells of MoUusca. This white rock has a most remark-
able lithological character, and glistens briUiantly when
lit up by the sun's rays. The shelly and pisolitic seams
which traverse this bed resemble those in the Pea-grit.
The surface of weathered slabs discloses numerous mi-
croscopic objects; the rock is in fact almost entirely
composed of organic debris. It measures about 10
c. A hard, fine-grained, ooHtic, sandy limestone, of a hght-
brown colour, lithologically dififerent from b. It contains
many fossil shells, which are extracted with difficulty ;
and passes into a hard yellow oohte with few fossils :
thickness from 8 to 10
.The lithological character of this rock is very different
to that of d, on which it rests..
The Cephalopoda-bed — Upper Lias.
d. A coarse, dark-brown, calcareo-siliceous rock, full of small,
dark, flattened grains of hydrate of iron. It contains