274 



CATALOGUE OF THE LOCAL FOSSILS IN THE 



Fragments of plants of species allied to or identical with those 

 of the preceding division. A few of the beds in the lower por- 

 tion, containing remains of Or this, Spirifora, and other brachio- 

 pods, appear to be of marine origin. 



This division crops out conformably beneath the Coal Measures 

 to the west, and forms a narrow belt running across the two 

 counties from the sea-coast between the mouths of the Coquet 

 and Aln to Stocksfield and Biding Mill on the Tyne ; thence it 

 follows the outcrop of the Coal Measures to the Wear and Tees. 

 It also caps the higher portions of the fells further to the west, 

 and forms the summit of the highest elevation of the Pennine 

 range — Cross Fell. In all the geological maps hitherto pub- 

 lished, too great an area has been assigned to this division of the 

 Carboniferous rocks in our district. The following section will 

 give a tolerably accurate idea of the nature of this series as it 

 occurs on tbe Derwent : — 



Fms. ft. 



Slate sill 2 3 



Plate 3 3 



Girdle beds 2 



Plate...; 2 3 



Sandstone, fine-grained 7 



Hazle, coarse 1 3 



Plate" and Bine whin 1 



Plate and Grey beds 2 



Sandstone and whin 1 2 



Plate and whin 1 5 



Plate 2 3 



Millstone grit 5 



Plate.. 4 3 



Hazle 2 3 



Fms. ft. 

 Grey beds (layers of slate clay 



and sandstone alternating) 1 



Sandstone 7 



Plate 1 



Hazle and slate 2 3 



Plate or Famp 2 



Hazle and plate 2 3 



Plate 2 



Hazle or slate 1 3 



Plate and Grey beds 1 3 



Grey beds 15 



Low grit 5 



Pebbles 



Plate 2 5 



82 



Yoredale Eocks. — In this series we include all the strata 

 from the Fell-top limestone inclusive to the Great "Whin Sill. 

 It is composed, as the appended section will show, of an assem- 

 blage of blue-coloured beds of carboniferous or encrinital lime- 

 stone separated by extensive layers of indurated sandstone 

 (hazle), bituminous shale (plate), thin seams occasionally of 



