Urrrr Sricn. 
L. Richardson—Great Oolite, Oxfordshire. 
539 
Thickness in 
a. Limestone, white, sparsely-oolitic, comparatively barren, and 
forming a cap to the limestone below (8c); Nerinea sp., 
Terebratula maxillata auctt. : about , ; ; 
§ < 6. Marl, greenish, often wanting: 0 to 4 inches 
ce. Szeconp Brock Bep. —Limestone, massive, weathering into 
blocks, whitish, crystalline-hearted, not usually very fossili- 
ferous ; Gervillia cf. waltoni, Lycett, Terebratu/a sp. 
Marl, brown, clayey, with a ereenish- grey zone at the centre and 
9 - rubbly limestone in the lower portion ; radioles of Hemieidaris 
bravenderi, Wright (common), Ostrea sowerbyi, M. & L., and 
Serpula : about : ¢ 
nea. 
Tuirp Brock Ben. — Limestone, not so prominent, dirty 
pan -grey and brown, with white shell- fragments 
. Marl, brown, with comminuted shells passing down into brown 
ana grey- blotched, sandy, clayey marl, with occasional thin 
eae layers towards the base 
a band, dark, the black colour being due to plant- -remains 
- Marl, ereenish- -grey, sandy, with plant-remains common. 
ais the south-eastern working this is the olay that anne 
oe ) Passes down into 
. Limestone, greenish-grey, sandy, with an even upper surface ; ; 
a iyexticall plant-remains, the cavities where they have been 
weathering so as to resemble borings 
6. FourtH Brock Bro. —Limestone, ‘hard, masslv ive, ereenish- orey, 
weathering white and into large blocks, but inter nally extremely 
hard and somewhat resembling Carboniferous Limestone 
Clay, pale greenish-grey, sandy, marly : : . 5 
- Limestone, yellowish-brown and greenish, sandy, with well- 
spaced yellow oolite-granules. Sometimes a regular bed, but 
difficult to measure, a disappearing in the south- 
eastern working . 
} 
\ 
i Marl, brownish- ereen, often indurated to form an impure 
10 
iil 
13 
J 14 
rubbly oolitice limestone, with eee white oolite- 
granules, passing down into 
A conspicuous blue shaly clay! ; Placunopsis. socialis, M. & ee 
Ostrea sowerbyi, M. & Li., Rhynchonella sp.: 4 to 10 inches . 
. Clay, browvish-green, marly, with Geeaticual irregular seams 
of brown oolitie marl or limestone, with the same species of 
poe as in 158; and this mto ‘ 
. Upper Osrrea - Bep. — Marl, brown, clayey, indurated, 
Cee. crowded with Ostrea sowerbyi, M.&L. . 
The last layer (15d) is intimately associated with the top 
eee of the bed below, which is :-— 
. Limestone, rubbly, oolitic, passing down into more compact, 
fitiacéy, coarsely- oolitic limestone, the weathered surfaces of the 
slabs of which exhibit innumerable small Gastropods, etc. 
eat YGurus sp. 
_ Thin courses of oolitie limestone and shaly marl, ‘softer than 
as overlying limestone, with a hard band of very "oolitie lime- 
stone at the base. This bottom band has large white oolite- 
granules, and is very shelly; Jsocrinws-ossicles, echinoid- 
_adioles, Pseudomonotis echinata (Sow.) : ‘ 
. Pale-yellow oolitic marl and rubble: 1 ft. 6 in. to 
. Lower Osrrea-Brep.—Deposit of pale-yellow and yellowish 
"marl, enclosing an extraordinary number of oysters and Riyn- 
chonelle. Most of the oysters have Serpule, polyzoans, and 
occasional specimens of Webbina on them, and are frequently 
pierced by the boring sponge Zadpina, thus showing that the 
deposit in which they oceur was of slow formation . 
Ss 
age 
Se. 
bo 
or 
la So) 
ine} 
bo 
2 
wm, 
i) (=) 
oom 
8 
1 Absent as such from the south-eastern working, where bed lée is thicker, 
tolerably conspicuous, and more of a limestone. 
