FOREST MARBLE : COLN ST. DENIS. 
369 
FIG. 106. 
Section through the Forest Marble and Great Oolite, Crickley 
Barroir, north-cast of Coin St. Denis. 
(Prof. E. Hull.) 
^ ;Vf.ojpgrt 
fl. Forest Marble. Shelly oolite with oyster-beds. 
b. Great Oolite. Hard, grey, and white sandy limestone, regularly bedded. 
Cirencestcr to Fairford and Burford. 
The false-bedded layers of Forest Marble were well shown in 
a quarry at Crickley Barrow, north-east of Coin St. Denis, 
where the beds were seen to rest on the Great Oolite. The 
section was described by Prof. Hull.* (See Fig. 106.) 
At Talland Quarry I noted the following section : 
(" Flaggy and rubbly stone . . 
Forest Marble - < Clays and thin fissile beds of oolite and 
I gritty limestone - 8 
FT. IN. 
40 

On the thin gritty layers, many trails occur; and among the 
fossils I obtained Pccten annulatus, P. lens, P. vagans, Ostrca 
Sowerbyi, ar=d Rhynchonella. 
At Poulton Quarry (see Fig. 107) we find beneath from 2 to 
4 feet of brown clay (2), an alternating series, 12 feet thick, of 
obliquely-bedded bands of oolitic limestone and grey clays -(I). 
The limestone or "blue stone," occurs in thin flags which ore 
largely employed for roofing- purposes, under the name of 
" Poulton Slates." From these beds I obtained Rhynclionclla 
obsoleta, Lima cardiiformia, Pccten lens, P. vagans, and a large 
Gryphcea. 
Towards Fairford the Forest Marble appears to diminish in 
thickness. South of Pilham Lodge, on the road to Quenington, 
we find a quarry exhibiting the following strata : - 
* Geol. Cheltenham, p. 71. 
E 75928. 
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