NOUTUUMBEHLAM) AND DUllilA.M. 239 



wliere both these beds iire seen dipping at the same angle as 

 the coal-measures. 



The friable yellow sandstone is present at almost e /ery place 

 along the escarjjment of the limestone, but it varies considerably 

 in thickness. It is very coarse and gritty, with strong lines of 

 false bedding ; and from its variable thickness within short dis- 

 tances, the superior Magnesian- Limestone must be unconformable 

 to it. 



The Red Sandstone, usually pointed out as the equivalent of 

 the German BiAldiegencks^ contains at Tynemouth and other locali- 

 ties an assemblage of genuine coal measure fossils. During tlie 

 last summer the following species were obtained from the cuttings 

 made for the new pier at Tynemouth — viz., Finites Brandlingi^ 

 Trigonocarpon NOggerathi^ Sigillaria renijormis, Lepidodendron^ sp. 

 indet., Ccdamites approximatus^ Calamites incequalis? ; ^ndiinthQ 

 shale immediately connected with the sandstone, Neuropteris 

 gigantea^ Sp)lienopteris lat/foUa, Cyclopteris dllatata^ &c. The spine 

 of Gyracanthus formosus has been found in the same bed near 

 South Shields. In consequence of the presence of so many 

 genuine coal-plants in this bed, its conformity to the coal- 

 measures, and the apparent want of conformity between the 

 friable sandstone and the superior Magnesian-Limestone, we 

 propose that these beds may for the future be considered true 

 coal-measures, and the uppermost members of the Carboniferous 

 System. 



In the above divisions, the names given originally by Prof. 

 Sedgwick have been adopted as far as possible. The terms 

 Pseudo-brecciated, Brecciated, and Crystalline, are not admissible 

 as divisional names. The former is the Concretionary or Cel- 

 sular limestone (Sedgw.), which is a more correct epithet than 

 the proposed ncAv name. The Breccia is too subordinate in the 

 series to require a particular name, and the limestones of the 

 series are all too crystalline to admit of this word as a divisional 

 term. 



The following Table \vill give a pretty correct idea of the dis- 

 tribution of the MoUuscan Fauna of the Permian System. The 



