On some recently discovered fossiliferous beds in the Silurian rocks of the Pentland Hills

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Abstract
A few years ago I read a short notice before this Society on some blocks of Fossiliferous Limestone which I had discovered in the Conglomerate at Habbie’s Howe, in the Pentland Hills. This Conglomerate, considered by Professor Geikie to be of Old Red Sandstone age, obtains a considerable thickness in this locality, and is well exposed in the gorge through which the Logan Burn runs from the higher valley into the lower about half-a-mile above the Loganlee reservoir. The Conglomerate is mostly composed of rounded and lenticular pebbles and blocks of Silurian grit and shale, without any appearance of fossils; but while examining the beds I discovered several masses of limestone, which upon inspection proved to be very fossiliferous. The limestone of which these blocks are composed has a coarse granular appearance, and is largely made up of corals of the genera Halysites, Heliolites, Favosites, and Petraia. Along with fragments of Encrinites and several species of Brachiopoda, it also contains a peculiar rounded body of a grayish colour, which appeared like a pebble in the limestone blocks. These Mr D. J. Brown, who accompanied me on several occasions, and myself, considered to be an organism; and on showing one of them to Mr Charles Peach he undertook to make a section from it for microscopic examination. This he succeeded in doing in a very satisfactory manner, and submitted the section to Mr Robert Etheridge, jun., who determined it to be a coral of a very fine structure; and, in a

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