vertical scale exaggerated. ) 
150 yards ; 
1 anch 
(Horizontal scale : 
Fig. 3.—Culting cast of Sodbury Tunnel. 
PROF, REYNOLDS AND MR. VAUGHAN ON THE 
DWN? 
[ Nov. 1902, 
IV. Tue Grear-OoLttre SERIES EAST OF SopBURY TUNNEL. 
COO et 
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a 
Forest-Marble 
shale, 
containing 
limestone-bands. 
Bradford-Clay 
facies 
predominant. 
equally 
numerous. 
Bradtord-Clay and 
Great-Oolite forms 
(Numerous 
lamellibranchs.) 
Pholadomya-Wand. 
White 
Oolite 
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As here defined, the 
Great - Oolite Series is 
taken to include all the 
beds which lie between a 
compact, sandy, non-oolitic 
limestone below, and a 
thick shale - series above. 
The sandy limestones be- 
low are those which we 
have already discussed 
under the Fullers’- Earth 
Series as Passage- Beds, 
and the shales above 
undoubtedly belong to the 
Forest-Marble Series. 
This definition affords 
a ready means of marking 
off the Great Oolite from 
the beds above and below; 
but, since the basis on 
which it rests is purely 
lithological, it apples only 
to the particular area with 
which we are dealing. 
In the actual section, 
as seen in the magnificent 
cutting east of the tunnel, 
nothing could be more 
clearly marked than the 
junction of the massive 
limestone-beds with a thick 
series of shales above: yet, 
if a hand-specimen is 
taken from one of the 
upper beds of the massive 
limestone-series, and com- 
pared with another spe- 
cimen taken from one of 
the ledge-like lmestone- 
bands in the shale-series 
above, the similarity of 
the two specimens both 
lithologically and  pale- 
ontologically is very 
striking. 
The: whole series ex- 
ceeds 100 feet in thickness, 
and consists essentially of 
* 
ae _ 
— 
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