328 



Geology oj Wiltshire. 

 No. 2. 





Quarry at Yatton Kennel, 



a {Forest marble). Fissile shelly oolite, resting obliquely on the Great 

 Oolite, 4 feet. 



b Great Oolite {upper zone). Regularly bedded massive shelly limestone, 

 7 feet. 



c {Lower zone). Shelly oolite, full of false bedding. The upper part coarse ; 

 the lower affording very fine building stone, which is followed underground, 

 16 feet. 



The superposition of the two zones is also open to view in a 

 road-cutting on the east side of Castle Combe. 



Besides the sections already mentioned, we may notice the 

 following : — quarry east of Tetbury ; road section, Thames Head 

 Bridge, south-west of Cirencester; quarries south of Bisley ; 

 quarry on the Cheltenham road, one mile from Stratton ; also 

 road-cutting at Stratton ; quarry near the railway station, Ciran- 

 cester ; quarry on the Burford road, two miles from Barnslej'^, on the 

 top of a ridge produced by a fault ; quarry north-east of Bilbury, 

 and east of Coin St. Aldwin's.' ^ 



' The section exposed in the cutting on the Corsham side of the Box Tunnel 

 affords an excellent opportunity for the study of the upper beds of the Great 

 Oolite, the so-called " Bradford Clay," and the Forest Marble. As stated in 

 the paper "On the Bradford Clay and its Fossils," in vol. vi. of the Magazine, 

 the Bradford Clay ought not to be considered as distinct from the Forest Marble, 

 (the next stratum above the Great Oolite), and an examination of the Corsham 

 cutting would lead to the conclusion that the Bradford clay may be even more 

 properly described as the junction bed of the Forest Marble and Great Oolite. 

 It there appears to be intercalated with the upper beds of the latter stratum to 

 such an extent that it is difficult to say where the one begins or the other ends. 

 These junction beds contain several species of fossil corals, e.g., Stylina, 



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