MARL-SLATE AND LOWER MAGNESIAN LIMESTONE. 197 



Claxheugh. — Less than a mile westward, in the railway cut- 

 ting at Claxhengh, is another fossiliferous locality in the Lower 

 Limestone. It may be remarked that the greater proportion 

 of the limestone exposed in this cutting belongs to the middle 

 member of the Series, which here also contains fossils. But 

 towards the west end of the cutting a rise fault to the west* 

 brings into section the Lower Limestone. The base of this rock 

 is not seen in the cutting, though in the old river bluff, a stone's 

 throw to the north, where it is only ten or twelve feet thick, and 

 unfossiliferous, its junction with the Marl-slate is very clearly 

 shown. In the cutting it is yellow, compact, and thin bedded. 

 Fossils are pretty plentiful in some of the thinner beds. Cer- 

 tain surface-planes are strewed with Chondrites virgatus, Miin., 

 interspersed with large Spirifera Zfrii, Fleni., and Chonetes 

 Hardrensis. Strophalosia lamellosa, Gei., similar in growth and 

 condition to the Westoe specimens, is also very common. 



LIST OF SPECIES. 

 Clidophoeus costatus, Brown. 



Gervillia antiqua, Miin. 



Spirieera TJeii (Clannyana), Flew. 

 Common. 



Strophalosia lamellosa, Gei. 

 Common. 



Strop. Goldfussi, Miin. 



Chonetes Hardrensis, Phillips. 

 Common. 



Cyihere Jonesiana, Kb)/. 



.Dentalina Permiana, Jones. 



Chondrites viegatus, Miin. 

 Common. 



; Mr K. Howsc first drew my attention to this fault. 



