(il-OLOGICAL LOCALITIES. 



or of North Wales, and the material which has presented itself has not been accompanied 

 with detailed geological or geographical information. Still an imperfect record, correct 

 as far as it goes, is better than none. 



DERBYSHIRE. 

 In the Limestone Rock or Toadstone Series [Scar] at 



31. Bakewell. One or two beautiful microscopical sections of limestone in 



the collection of Mr. H. C. Sorby, F.R.S. 



STAFFORDSHIRE. 



32. North. Staffordshire. Microscopical sections in Mr. Sorby 's collec- 



tion, without particulars as to exact locality. 



SHROPSHIRE. 



33. Llan-y-Mynech, near Oswestry. Specimens in the collection of Dr. 



Harvey B. Holl, of Perdiswell, Worcester. 



34. Steeraway. Mr. C. Moore's collection. 



CARNARVONSHIRE. 



35. Bangor. Two fine microscopical sections of Carboniferous Limestone in 



Mr. Sorby 's collection. 



36. Great Ormes Head. An outlier of the Carboniferous Limestone. 



Specimens in Dr. Harvey B. Holl's collection. 



Bristol District. 



The Avon section of the Carboniferous Limestone is divided into three principal 

 groups, thus 



I. Upper shales or grits. 



Ca. Upper Mountain Limestone (coralline). 

 IIx b. Middle Mountain Limestone (not very fossiliferous). 



\_c. Lower Mountain Limestone (rich in Fishes, Brachiopoda, &c.). 

 III. Lower limestone shales (very fossiliferous). 



5 



