R. Cooksey Burton — Yellow Sands and Marl. 299 



the sterile segments of Bernoullia. Among recent ferns stalked 

 pinnules occur not infrequently, e.g. in species of Adiantum, Petlcea, 

 Llavea, Polybotrya, Osmunda, Bidymochlcena, and other genera, but 

 it is noteworthy that among fossil Ferns and Pteridosperms stalked 

 pinnules are very uncommon. One of the few examples known to 

 me is Neuropteris Granyeri, a species originally described by 

 Brongniart 1 from the Coal-measures of Ohio, and more recently 

 figured by Zeiller 2 from France. In this Upper Carboniferous species 

 the pinnules possess the venation and auriculate base characteristic of 

 Neuropteris, and differ widely from those shown in Fig. 1. 



It is unfortunate that the South African plant is represented only 

 by a single specimen, and that an imperfect one. While venturing to 

 institute a new genus, I hope that additional material may be obtained 

 which will lead to a more satisfactory knowledge of the affinity of the 

 plant. In the absence of fertile specimens the question of taxonomic 

 position cannot be definitely settled, though the presumption is that 

 the frond is that of a fern. 



Stormbergia, gen. nov. Plate XIV. 



Fronds characterized by pinnules with the Cladophlebis type of 

 venation, attached to the pinnae by a short stalk. The lamina is 

 suddenly contracted at the base and not auriculate. 



Stormbergia Gardneri, gen. et sp. nov. PI. XIV, Figs. 1, la-c. 



The specific characters are enumerated in the description already 

 given. The specimen was discovered by Mr. S. P. Gardner in the 

 Stormberg Series at Cyphergat, Cape Colony. 



III. — On the Occurrence of Beds of the Yellow Sands and Marl 



IN THE MaGNESIAN LlMESTONE OF DURHAM. 



By E. Cooksey Burton, B.Sc, Armstrong College. 



DUPING an investigation of the ' Yellow Sands ' and Magnesian 

 Limestone of Durham and Northumberland, several lenticular 

 and irregular hollows or caverns, containing 'Yellow Sands' and 

 light yellow marl, were noticed in the Lower Brecciated Magnesian 

 Limestone at Trow Pocks, about one mile south of the Tyne (see Map, 

 Fig. I). 3 



The 'Yellow Sands' and marl in some cases are found as separate 

 beds, whereas in others they are mixed together irregularly. The 



1 Brongniart, Hist. Vig. foss., p. 237, pi. lxviii, fig.,1, Paris, 1828. 



2 Zeiller, Bassin Houill. et Perm. cPAutun et d'Epinac, p. 145, pi. xi, 

 figs. 6, 6a, Paris, 1890. 



3 The classification of the Permian adopted in this paper is as follows : — 



7. Upper (Concretionary) Magnesian Limestone. 

 6. Upper Middle Magnesian Limestone. 

 5. Brecciated Magnesian Limestone of irregular thickness. 

 4. Disturbed beds of Lower Limestone. 

 3. Undisturbed Beds of Lower Limestone. 

 2. Marl Slate. 

 1. Yellow Sands. 

 The ' Yellow Sands ' lie unconformably on the Coal-measures. 



