300 



R. Coolisej/ Burton — Yellow Sands and Marl. 



'Yellow Sands', even when regularly bedded, contain a considerable 

 amount of calcareous marly material, being in this respect rather 

 different from the 'Yellow Sands' as they outcrop in the normal position 

 beneath the Marl Slate and Magnesian Limestone. When, however, 

 the sand from these included beds is washed with acid, there is no 

 difficulty in recognizing the well-worn and rounded grains of the 

 typical wind-hlown 'Yellow Sands'. 



TYNE MOUTH 



50UTKSHIELDS 



Trov* rocks 

 \French mans Ba y 



Marsden 

 Bay 



Tunstcdl Hill 



3 Miles. = I Inch. 



YHOPE 



Fig. 1. Sketch-map showing places mentioned in this paper. 



The manner in which the deposits occur in the breccia is difficult to 

 describe, as they are very variable in shape ; but it will be convenient 

 to recognize three classes — 



1. 'Yellow Sands' and yellow marl occurring in small pockets 

 and hollows in the Breccia. 



2. Irregular beds lying in horizontal and nearly vertical and 

 parallel fissures, all filled with ' Yellow Sands ' mixed with marl in 

 various proportions. 



3. Lenticular and cavernous hollows filled by alternating beds of 

 ' Yellow Sands ' and marl. 



