76 



OOLITE LIMESTONES. 



Upper 

 Gallery. 



Wall-case 43. 



Portland stone, see B. Hunt's "Descriptive Guide" 



PP 



) The Roach bed is very hard, and is used for 



foundations of breakwaters, and in works where strength 



See 



is required, but it will not bear a close even face. 

 Map 17, and horizontal section No. 20. — II.W.B. 



• 49. — Coral rag, Oolitic Limestone. — Woodhouse Cross 

 near Gillingham, Dorset. 



The coral rag of this district is burned for lime, and fur- 

 nishes a stone fit for rough building purposes. Further 

 south, at Marnhull and Todbere, it becomes a thick-bedded, 

 white oolite, which is quarried for freestone. Some of the 

 neighbouring churches have been built of the stone from the 

 last-mentioned quarries. Map 18 H.W.B. 



50.— Inferior oolite limestone, " Gryphite bed," from 



Pi 



Infi 



At 



tone is clearly developed. The rock is very fossiliferous, 

 being charged with Gryphcea, Trigonia, Modiola, and Lima. 

 The whole thickness of the zone cannot be less than forty- 



five feet." 



) 



51. — Great oolite, White Oolitic Limestone, containing 

 fossils. — LLampton Common, near Stroud, Gloucestershire. 



52.— Portland stone, Oolitic Limestone, underlying the 

 chalky limestone No. 97, and containing the carbonised im- 

 pressions of plants.-— Oakley Quarry, Tisbury, Wilts. 



This bed, termed by the quarrymen " the devil's bed," 

 is quarried for freestone, and used for buildings. When 

 first extracted from its bed, the stone is soft, and of a green 

 colour ; but it becomes harder and nearly white on exposure 

 to the air, and after the quarry water has dried off. It con- 

 tains flints, both irregularly disseminated and in occasional 



layers. (See Wall-case &2, Nos. 32 to 35.)— H.W.B. 

 53. — Portland stone, Oolitic limesto ne ("fretting bed" 



of Portland stone). — Oakley Quarry, Tisbury, Wilts. 



In the Vale of Wardour the lowest beds quarried for 

 stone are called by the quarrymen " fretting beds." They 



<n 



I 



Tte fin 



it is 

 and oilier p' 

 and furnislic 



57—Ful: 



a, and j 

 mr Clidkh 

 The fuliei 



