540 L. Richardson— Great Oolite, Oxfordshire. 
Thickness in 
in. 
a. Limestone, well-oolitic, with coarser oolite-granules and shell- 
a debris ; often obliquely stratified. Splits up at the top, and 
g 18 greenish shaly marl is intercalated; Ostrea sowerbyi,M.&L. 2 6 
D 6. Green and brown shale in alternating layers ; lignite OnE 
2 a. Limestone, in three beds, oolitic and shelly in places; Ostrea 2 0 
les b. Rubble and marl with Ostrea (common); radioles: lto4in. 0 2 
© \ 94 ¢. Limestone, massive, shelly, oolitic. Top somewhat waterworn 
4 and in uppermost 2 inches Chlamys vagans (Sow.) is not 
uncommon: seen : ° ‘ - : ; : >») OameO 
50/730 
South-Western Working.—This working, as already mentioned, was 
where the stone was last worked, and where the succession of beds 
from sixteen upwards was noted. The blocks that are lying about, 
and are so full of specimens of Zerebratule, will be readily-recognized 
as having come from bed 6. 
It will be unnecessary to say anything more about this working, as 
the record given above is so full. 
South-Eastern Working.—In the eastern face of this working, which 
is the more weathered of the two, and therefore that in which the 
hard bands stand out in greatest relief, the principal beds that can be 
readily found are the disturbed top-limestones (beds 1 and 2); the 
rather greenish’ marl (4a) with a yellow band (44) at the base; the 
white marl (5); and then the four great block beds (6c, 8c, 10, 126), 
of which the upper two are the most massive. The third and fourth 
block-beds down, when traced along the southern face of the working, 
become relatively inconspicuous. In the eastern face, below the fourth 
block-bed, come marls (18 and 15a) with a median, rather impersistent 
limestone (14), and then rubbly limestone (15c) at the very base. 
This rubbly limestone, when followed along the southern face, is seen 
immediately above the Upper Ostrea-Bed, which—with the Lower 
Ostrea-Bed—will form a quick means of locating the minor divisions 
that have been made in the lower portion of the section. It should 
be particularly noticed that the blue marl (154) is absent as such from 
this working. 
It is in this working that the Lower Ostrea-Bed is best developed 
and most conveniently investigated. 
North-Eastern Working.—In this working—now long abandoned— 
the highest beds seen are those in the eastern face. The two lime- 
stones are the two top block-beds, and the second one is the top-limestone 
of the western face. Here, the third block-bed is poorly-developed ; 
but the fourth is more conspicuous and has underneath it greenish 
marl—bed 13. The Upper Ustrea-Bed can be located above bed 16a, 
which is the limestone protruding at the bottom of the working. 
Western Working.—Vhis working runs below and parallel to the 
road. The top conspicuous limestone is the lowest block-bed (126), 
and the green marl immediately below it is as conspicuous as ever. 
The Upper Ostrea-Bed is the next easily-found horizon. Below it is 
the limestone (16a) and the softer marls, which form the lower portion 
1 Looks greenish, but upon closer inspection is better described as ‘ greyish- 
white ’. 
