Vol. 69.] FROM A BORING AT SOT/THALL. 83 



Holopty chius and Bothriolepis occur together in the Upper Old 

 lied Sandstone of Morayshire and Fifeshire ; in a corresponding 

 formation north of St. Petersburg (Russia) ; and in the Cats-kill 

 Formation of Pennsylvania (U.S.A.). Holopty chius is also met -with 

 in the Upper Devonian of Belgium, while Bothriolepis is known, 

 from a yellow sandstone just below the Carboniferous Limestone 06' 

 Farlow (Shropshire). The remains found in the red sandstone iiv 

 the Southall boring, therefore, although so fragmentary, are enough 

 to indicate its Upper Devonian or Upper Old Red Sandstone age.. 



EXPLANATION OF PLATE X. 



[All the figures are magnified 3 diameters.] 



Fig. 1. Scale of Holoptycliius sp., from within, the exposed portion shown in 7 

 impression on frhe matrix. 



2. Scale of Holoptychius sp., inner face. 



3. Dermal plate of Bothriolepis sp., the ornament shown in impression on 



the matrix. 



Discussion. 



The President (Dr. A. Strahan) commented on the difficulty of 

 the search for fossils which had been brought to so successful 

 an issue by the Author. He had himself always been of opinion that 

 the red strata present in the borings at Richmond, Streatham T 

 Crossness, AVillesden, Chiswick, and Southall were of Old Red 

 Sandstone age, and had so classed them in the table of borings 

 published by the Royal Commission on Coal-Supplies. This,, 

 however, was merely an opinion, founded on a lithological resem- 

 blance with the rocks of South Wales. The definite proof of the 

 existence at Southall of those upper beds of the Old Red. Sandstone 

 which pass up into the Carboniferous was of great value. 



Dr. J. W. Evans congratulated the Author on the excellent use- 

 that he had made of the opportunity afforded by the boring, which, 

 he only heard of by a happy chance. He suggested that the law 

 should require that full information with regard to borings should 1 

 be given to the Geological Survey. 



He thought that the association of Old Red Sandstone and' 

 Devonian types could hardly be described as a new fact in the 

 geology of this country. It occurred in the South of Ireland, in 

 Pembrokeshire, and, above all, in North Devon, where three- 

 separate occurrences of typical Old Red Sandstone were succeeded, 

 by marine Devonian. The two are also associated in the Psam- 

 mites de Condroz in Belgium, where some beds contain Holopty chins: 

 and Asterolepis, and others a fauna allied to that of the Lower Pilton 

 Beds. The Southall cores were compared with the PickweR-Down 

 Sandstone, in which obscure fish-remains have been found ,-. and itj 

 was suggested that they were probably younger than the Frasnian 

 of the Tottenham-Court Road boring and older than the cores of 

 the Turuford bore, which contained a Lower Pilton fauna. 



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