Upper 

 Gallery, 



Wall-case 42. 



i 



66 CHERT, FLINT, 



19. — Polished chert in Carboniferous Limestone Mat* 



lock, Bath, Derbyshire. 



19a. — Polished specimen of chert, from Carboniferous 

 Limestone. — Middleton Moor, Wirksworth, Derbyshire. 



20, 20a. — Chert in Carboniferous Limestone. — Matlock 

 Bath, Derbyshire. 



21. — Chert, in Carboniferous Limestone. — Middleton 

 Moor, Wirksworth, Derbyshire. 



22. — Chert, containing minute crystals of quartz : from 

 Carboniferous Limestone. Middleton Moor, Derbyshire. 



23. — Chert, containing silicified Corals. From Carbon- 

 iferous Limestone. — Masson Hill, Matlock Bath, Derbyshire. 



24. — Chert, from Carboniferous Limestone. — Middleton 

 Moor, Derbyshire. 



25. — Chert, containing casts of Encrinites, from Carbon- 

 iferous Limestone. — Bakewell, Derbyshire. 

 26. 



27. — Chert, from Carboniferous Limestone, showing a 

 weathered surface. — Cromford, Derbyshire. 



28. — Chert, in dark-coloured carbonaceous beds of Car- 

 boniferous Limestone. (See " Memoirs of Geological Survey," 

 vol. i., p. 134.) — Cow's Bill Quarry, Oystermouth, Glamor- 

 ganshire. 



29. — Chert, forming the lower part of rocks which are 

 the equivalent of Millstone Grit. — Pen-ijr-Htnblas, near 

 Holywell, Flintshire. 



30. — Chert, in Carboniferous Limestone. — Quarry, north 

 of Clogrenan Quarry, Queen's County, Lreland. 



31. — Chert, from the upper calcareous beds of the Upper 



Green- Sand. — One mile north of Brixton, Isle of Wight. 



32. — Chert, from Upper Green- Sand. — Arreton, Isle oj 

 Wight. 



33. — Cherty flint, from lower Purbeck beds. — Oakley 

 Quarry, near Tisbury, Wilts. 



34. — Cherty flint, from the upper beds of Portland 

 Stone. — Oakley Quarry, Wilts. 



35, 35a, — Cherty flint, containing fossil shells, and 



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