On Old Red Sandstone Plants showing Structure, from Brecon, South Wales

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Abstract
The plants that are described in this communication represent the first recorded occurrence of well-preserved early Devonian plants in England and Wales. The fossil locality was first observed by Mr. F. N. Gossling, B.A., of the Post Office Survey Department, who informed Prof. A. H. Cox of the occurrence. Prof. Cox and I subsequently examined the locality, and collected a large number of specimens, and I am greatly indebted to Prof. Cox for handing over to me the investigation of the fossil plants. The quarry from which the fossil plants were collected is situate on the western side of the road between Merthyr and Brecon, and lies 7½ miles south of Brecon. (See fig. 1, p. 196.) The plant-remains are entombed in sage-green arenaceous shales, which are intercalated among the typical sage-green sandstones of the Senni Beds of this locality. The fossil plants appear to be confined to the sediments of finer grain. Some of the plants in this Brecon assemblage of early Devonian types assume an increased importance, on account of their perfect mode of preservation, which enables a more or less complete account of the anatomy of the vegetative organs to be furnished. The plants exhibit great diversity in their mode of preservation. At first sight, most of the fossils appear to consist of carbonaceous material. A closer investigation, however, reveals the fact that in many cases a carbonaceous film merely covers the interior of the stem, which has been subject to varying degrees of pyritization. In some

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