MUSEUM OF THE NATURAL HISTORY SOCIETY. 287 



the Cheviot porphyry iu Biddleston Burn, and in the Coquet 

 below Linn Brig." — Tate. 



Stigmaria, Lepidodendra, Coniferous trees, and other plants 

 occur in some parts of the group. There are no workable beds 

 of coal. The Fauna consists chiefly of fish-remains,- Mocliolse 

 and Entomostraca. In one bed on the Tweed, Orthocerata and 

 Pleurotoniarise are associated with coniferous wood. The whole 

 group is specially distinguished by the absence of Brachiopods, 

 which are abundant in the overlying series. Generally fresh- 

 water and lacustrine conditions are indicated ; and when marine 

 remains do occur, they are accompanied with plants which 

 appear to have been swept into the shallow estuary." 



The local fossils of this series are represented in the collection 

 by one or two species collected at Norhain by Mr. Geo. Tate, 

 and are mentioned in the preceding list. A fuller list may be 

 found in the Memoirs of the Geological Survey. 



The Fossils illustrating this series from the neighbourhood 

 of Edinburgh are arranged in Side-case 40. 



DEVONIAN. 



"In Northumberland we find it in Eoddani Dene, on the 

 flanks of the Cheviot porphyry, where it contains rolled pebbles, 

 and blocks of this porphyry, showing that the Cheviots had been 

 protruded previously to the deposition of the Old Bed Con- 

 glomerate. In Berwickshire, where this formation occupies a 

 considerable area, there is no physical break between the Old 

 Bed Sandstone and the Carboniferous formation ; but the limits 

 of the former are nearly marked by the occurrence of Solop- 

 tychius nolilissimus and Pterichthys major, which are character- 

 istic of the upper beds of the Old Bed Sandstone." — Geo. Tate. 



SILUBIAN. 



" Small portions of this formation occur in the westernmost 

 part of Northumberland, where it is seen on the flanks of the 

 porphyry of the Cheviots, on the Coquet, above Philip, and 

 again in a similar position at "Whitelee on the Beed, near to 

 Carter Pell." 



